even though sickle cell confers no advantage in the malaria-free u.s., african americans have a relative high incidence of the gene. this is an example of

Some advantages of sexual reproduction over asexual reproduction include:

Sexual reproduction and asexual reproduction are two different mechanisms by which organisms can reproduce.

Sexual reproduction involves the fusion of gametes from two different individuals to produce offspring, while asexual reproduction involves the production of offspring from a single parent without the fusion of gametes.

Here are some advantages of sexual reproduction over asexual reproduction:

Genetic diversity: Sexual reproduction results in genetic diversity among offspring because each parent contributes half of their genetic material to the offspring. This genetic diversity can provide an advantage in changing environments because it increases the likelihood that some offspring will have traits that are better suited for survival.

Adaptation: Sexual reproduction allows for the production of new combinations of genes that can lead to adaptations that enable organisms to survive in their environment. This can result in populations that are better adapted to their environment over time.

Evolutionary potential: Sexual reproduction contributes to the evolutionary potential of a population by creating new genetic combinations that can be acted upon by natural selection.

Elimination of harmful mutations: Sexual reproduction helps eliminate harmful mutations from a population because the recombination of genetic material during meiosis can separate deleterious mutations from advantageous ones.

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Protein hormones are lipid-soluble.

Lipid-soluble hormones can pass through cell membranes, allowing them to travel throughout the body. They are not affected by changes in pH or ionic strength, so they remain stable in the body for longer than water-soluble hormones.

Lipid-soluble hormones are not soluble in water, however, they are soluble in both lipids and lipophilic solvents. Lipophilic hormones are important for cell signaling, regulation, and development. They bind to specific receptors located on the surface of target cells and initiate the signaling pathways that lead to physiological responses.

Lipophilic hormones are also important in modulating the transport of ions and molecules across cell membranes, thereby controlling cell homeostasis.

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Answer:

A.

Explanation:

Animals migrate further south to warmer locations. Animals such as bears and squirrels come out of hibernation.

The cells that provide this support and protection in neural tissue are called glial cells, also known as neuroglia. Although neural tissue has a minimal extracellular matrix, it still requires support and protection.

Glial cells are non-neuronal cells that surround and support neurons in the nervous system. They make up about half of the total volume of the nervous system and have a variety of functions, including providing structural support and protection to neurons, regulating the extracellular environment around neurons, and aiding in neuronal signaling. There are several types of glial cells, including astrocytes, oligodendrocytes, microglia, and ependymal cells, each with their own specific functions.

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In photosystem II, the electrons are donated by water molecules to the primary electron acceptor. The oxygen atom is replaced when these electrons are donated.

The oxygen and hydrogen ions are formed by the splitting of water molecules during photosynthesis. The oxygen atoms are released into the air while the hydrogen ions are transported to the thylakoid space through the electron transport chain for the production of ATP energy. This process occurs in the thylakoid membrane, which consists of two photosystems (PS I and PS II) and electron transport chain complexes. The electron transport chain (ETC) is a series of redox reactions in which electrons are transferred from high-energy electrons to low-energy molecules.

Photosystem II is the first photosystem, and it receives photons from light energy. The electrons produced from the splitting of water molecules are taken up by PS II, and they then travel through the ETC to PS I, where they combine with NADP+ to produce NADPH. ATP is also produced during this process.

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The method that farmers should choose to minimize costs for efficient pest removal while still reducing the amount of pollution in the river is by introducing a natural predator to feed on the pests.The correct answer is d.

Pests are organisms that damage, harm, or cause discomfort to humans, other animals, and plants. Pests that attack crops are called agricultural pests or crop pests. They include rodents, insects, nematodes, and pathogens.Pest management is essential in the reduction of crop damage while also minimizing the amount of pollution that ends up in the river.

Farmers use various methods to manage pests, some of which include physical traps, applying a single dose of pesticides, planting genetically modified crops, and introducing a natural predator to feed on the pests.The following are methods that farmers should choose to minimize costs for efficient pest removal while still reducing the amount of pollution in the river:Introducing a natural predator to feed on the pests.

This is a method where farmers introduce other animals that prey on pests. It is one of the best methods to control pests and also helps farmers to save money. Using physical traps is another method that farmers should use. They are cheaper, easy to use, and environmentally friendly.

The complete question is given below:

Which of the following methods should the farmers choose to minimize the cost of efficient pest removal while still reaching their goal of reducing the amount of pollution in the river?

A.responses using physical traps using physical traps

B.applying a single dose of pesticides

C.applying a single dose of pesticides planting genetically modified crops

D.planting genetically modified crops introducing a natural predator to feed on the pests

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The fingers, toes, palms, and ears contain arteriovenous anastomoses (AVAs), which are connections between arteries and veins and this allow heat to be diverted away from the extremities if the body is becoming hypothermic. .

The diversion of heat serves to keep the core of the body warm and maintain the body's overall temperature.

The AVAs work by shunting blood away from the extremities in order to direct more blood to the body's core. This process is known as vasoconstriction, and is triggered by a drop in core body temperature.

This process helps to conserve heat by reducing the amount of blood that is directed to the extremities, which lowers the overall heat loss from the body.

The AVAs are also important for ensuring that blood reaches the body's vital organs, such as the heart and brain, even if the body is in a state of hypothermia.

This is because the AVAs are able to bypass the cold extremities and deliver oxygenated blood directly to the organs, ensuring that they can continue to function properly.

Overall, arteriovenous anastomoses in the fingers, toes, palms, and ears play an important role in the body's ability to regulate temperature and ensure that oxygenated blood reaches the vital organs.

By allowing heat to be diverted away from the extremities, they help to conserve heat and maintain the body's temperature. They also bypass the cold extremities, allowing oxygenated blood to reach the organs.

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In an adult, the cell type that is LEAST likely to enter a programmed G₀ phase of the cell cycle is D. Neurons.

The G0 phase is a quiescent stage in the cell cycle where cells are not actively dividing or preparing for division. It can be temporary or permanent, depending on the cell type.

A. Liver cells - These cells can enter the G₀ phase but are also capable of re-entering the cell cycle to regenerate and repair the liver tissue when needed.

B. Kidney cells - Similar to liver cells, kidney cells can also enter the G₀ phase and re-enter the cell cycle for tissue repair and regeneration.

C. Epithelial cells - These cells line the surfaces of our body and are constantly exposed to wear and tear. They can enter the G₀ phase, but they typically have a high rate of cell division to maintain the integrity of the epithelial layer.

D. Neurons - Neurons are specialized cells in the nervous system responsible for transmitting nerve impulses. In an adult, most neurons are permanently in the G₀ phase, as they do not usually undergo cell division after maturation. This makes neurons the least likely cell type to enter a programmed G₀ phase among the given options, as they are generally already in the G₀ phase and do not re-enter the cell cycle.

Therefore, D is the correct option.

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The existence of vestigial structures supports the idea of evolution by natural selection.

Anatomical traits known as vestiges are those that, as a result of evolution, have lost their original purpose over time. These structures are frequently the remains of characteristics that were once beneficial to an organism's progenitors but are no longer required for the organism to survive or reproduce in its current environment.

Vestigial structures are indicators of the evolutionary history of life on Earth and are found in all living things. It implies that organisms have changed over time and that certain once-useful structures have been rendered useless as a result of adaptations to new surroundings and natural selection.

According to the theory of evolution by natural selection, organisms with beneficial qualities have a higher chance of surviving and reproducing, passing those traits on to subsequent generations.

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Inducible genes are those that are expressed only when there is an inducing agent present in the cell, Constitutive enzymes are those that are continuously expressed under normal growth conditions, Non-inducible genes are those that are not affected by any changes in the environment.

a. Inducible: Inducible genes are those that are expressed only when there is an inducing agent present in the cell, typically a small molecule. Induction of the genes for enzymes involved in lactose metabolism is controlled by lactose availability in the environment.

b. Constitutive: Constitutive enzymes are those that are continuously expressed under normal growth conditions. The genes for the enzymes involved in glycolysis are an example of this.

c. Non-inducible: Non-inducible genes are those that are not affected by any changes in the environment. These genes are typically used for essential metabolic processes that are not dependent on environmental changes.

Explanation:

Lactose is a disaccharide that is broken down into glucose and galactose by the enzymes β-galactosidase and lactose permease.

The expression of these enzymes is regulated by the availability of lactose in the environment. The genes for these enzymes are typically inducible, which means they are only expressed when lactose is present in the cell.

Constitutive genes, on the other hand, are those that are continuously expressed under normal growth conditions.

These genes are typically involved in essential metabolic processes that are required for normal growth and development. For example, the genes for enzymes involved in glycolysis are constitutive genes that are continuously expressed.

Finally, non-inducible genes are those that are not affected by any changes in the environment. These genes are typically used for essential metabolic processes that are not dependent on environmental changes.

For example, the genes for enzymes involved in DNA replication are non-inducible genes that are always expressed at a constant level.

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Genes A and B are not on the same chromosome.

The law of independent assortment is one of the laws of inheritance that describes the way different genes independently separate from one another when reproductive cells develop. When two or more characteristics are studied, the law of independent assortment helps to determine the proportion of traits produced by different gametes. Chromosomes do not assort independently if they are linked.

If genes are closely linked on a chromosome, they may have a higher chance of being inherited together. When genes are unlinked, they will assort independently, and the gamete frequency is an indicator of their independence. If genes are on the same chromosome, they will tend to stick together when crossing over occurs, making the gamete frequencies of each kind non-equal. Chromosome structure and the frequency of recombination are the most important factors that influence linkage.

Therefore, it can be concluded that genes A and B are not on the same chromosome.

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70% of cases of foodborne illness are either undiagnosed or misdiagnosed because they are caused by   Bacteria.

Bacteria is one of the main causes of foodborne illness, and it is estimated that 70% of these cases are either undiagnosed or misdiagnosed due to the difficulty in detecting bacteria in food. Bacteria can be spread through contaminated food and water, and can cause a wide range of symptoms ranging from stomach pain to vomiting and diarrhea.

There are a variety of methods used to detect and identify bacteria in food, including culture testing and nucleic acid amplification tests. In order to prevent foodborne illnesses, it is important to ensure that food is properly stored, handled, and cooked in order to prevent the growth and spread of bacteria. Additionally, if someone suspects they have contracted a foodborne illness, they should seek medical help and be tested for bacteria.

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Glucose is an important source of energy for cells. When glucose enters a cell, it can be used in several ways depending on the cell type and the metabolic state of the cell.

In most cells, glucose is metabolized through a process called glycolysis, which occurs in the cytoplasm. During glycolysis, glucose is converted into pyruvate, which can then enter the mitochondria for further energy production via the citric acid cycle and oxidative phosphorylation.

In some specialized cells, such as liver and muscle cells, glucose can be stored as glycogen, which is a polymer of glucose. This occurs in the cytoplasm as well. When glucose is needed for energy production, glycogen can be broken down into glucose units through a process called glycogenolysis, and then metabolized through glycolysis.

Overall, the fate of glucose in a cell depends on the energy demands of the cell and the availability of other energy sources. However, in most cases, glucose is first metabolized through glycolysis in the cytoplasm, and then further processed in the mitochondria to produce energy in the form of ATP.

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Answer:

The selection that is changing bacteria in populations is natural selection. Bacteria populations can evolve through natural selection, which occurs when certain traits that confer a reproductive advantage are favored, and thus become more prevalent in the population over time.

In the case of bacteria, natural selection can occur through a variety of mechanisms. One example is the acquisition of antibiotic resistance. Bacteria that have a genetic mutation or acquire a resistance gene through horizontal gene transfer may be able to survive and reproduce in the presence of antibiotics, while bacteria that do not have the resistance gene will die off. Over time, the proportion of bacteria in the population that have the resistance gene will increase, leading to an overall increase in antibiotic resistance in the population.

Other factors that can drive natural selection in bacteria populations include changes in environmental conditions, competition for resources, and the ability to adapt to different niches or host organisms. In general, natural selection favors traits that increase an organism's ability to survive and reproduce in a particular environment or ecological niche.

The CPT code assigned for the percutaneous venous transluminal balloon angioplasty of the brachiocephalic vein, performed as a distinct procedural service (during the same operative session as the primary cabg procedure) is 33833.

This procedure is the percutaneous transluminal angioplasty of a vein by means of balloon dilatation and includes insertion of a guide wire, catheter, angioplasty balloon, contrast injection and removal of catheter. The code should be reported once per vessel and per session.

This procedure is done when the brachiocephalic vein is narrowed or blocked due to a clot, fibrous tissue, or fatty deposits in the walls of the vessel. It may also be done to improve the blood flow in the vein and relieve symptoms associated with reduced flow.

The procedure is done by making a tiny incision and inserting a catheter with a balloon tip, which is then inflated to open the narrowed vessel. This increases the blood flow to the heart and improves the patient's symptoms.

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The major histocompatibility complex (MHC) molecules, with human leukocyte antigens (HLAs), are markers on all nucleated cells and have an important role in the immune system.

MHC molecules are responsible for presenting antigens to T cells, which are a type of lymphocyte that plays a vital role in the immune system. Antigens are molecules that are recognized by the immune system, and they can be derived from pathogens, cancer cells, or other foreign substances. When an antigen is presented to a T cell by an MHC molecule, it can trigger an immune response.

There are two types of MHC molecules: MHC class I and MHC class II. MHC class I molecules are found on all nucleated cells, and they present antigens to cytotoxic T cells. Cytotoxic T cells are responsible for killing cells that have been infected with viruses, as well as cancer cells. MHC class II molecules are found on antigen-presenting cells, such as dendritic cells, macrophages, and B cells. They present antigens to helper T cells, which are responsible for activating other cells of the immune system.

Therefore, the major histocompatibility complex (MHC) molecules, with human leukocyte antigens (HLAs), are markers on all nucleated cells and have an important role in the immune system by presenting antigens to T cells, which can trigger an immune response. There are two types of MHC molecules: MHC class I and MHC class II, which present antigens to cytotoxic T cells and helper T cells, respectively.

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The complete question is-

What is the role of the major histocompatibility complex (MHC) molecules, with human leukocyte antigens (HLAs), in the immune system?

The claims made concerning aquatic biomes are all false.

False, Nutrients are no longer accessible to creatures once they reach the bottom of lakes.

False, Because of its size, the ocean is unaffected by human activity.

The first claim, "Nutrients are no longer accessible to creatures after they drop to the bottom of lakes," is false. It is true that nutrients may at first settle at the bottom of lakes, but they may be recycled back into the ecosystem through procedures including upwelling, decomposition, and nutrient recycling by benthic species.

The second claim—that because the ocean is so big, human influences do not affect it—is false. Human activities like pollution, overfishing and climate change have a significant influence on the ocean and can result in biodiversity losses, food chain disruptions, and changes in the ocean's chemistry.

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The question is-

Which of these statements about aquatic biomes is true? Select True or False for each statement. T/F Once nutrients sink to the bottom of lakes, they are no longer available to organisms and the ocean is so vast that it is not influenced by human impacts.

The first diagram is of the human organs chart is of the lung, The second diagram is of the stomach and The third diagram is of the kidney.

Here is a general guide to identifying and labeling histological structures:1. Identify the tissue type: Determine whether the tissue is epithelial, connective, muscular, or nervous. Look at the arrangement of cells, the type of cells present, and the presence of any extracellular matrix.2. Identify the organ: Once you have identified the tissue type, you can then identify the organ it belongs to by looking at the overall shape, structure, and location of the tissue.3. Label the parts.

Finally, label the specific parts of the organ, such as the lumen, basement membrane, glands, or blood vessels. Here are some commonly studied organs in histology, along with their identifying features: Organ: Stomach, Tissue type: Simple columnar epithelium, Location: Upper left quadrant of the abdomen, Features: Rugae, gastric pits, glands, muscularis mucosae, submucosa Organ: Liver, Tissue type: Parenchymal and stromal cells

Location: Upper right quadrant of the abdomen, Features: Hepatocytes, sinusoids, bile canaliculi, central vein, portal triad, Organ: Kidney, Tissue type: Nephron, Location: Abdominal cavity, Features: Glomerulus, Bowman's capsule, proximal and distal convoluted tubules, collecting duct, renal pelvis, ureter.

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Answer:

1. Blue

2. Red

3. Red

4. Blue

5. Red

My bad if I get it wrong

Answer:

A. 5, 1, 3, 2, 4

Explanation:

In the DNA REPLICATION PROCESS, first the DNA is unwound by the help of helicase enzyme. Following this, the bonds between base pairs are broken down to seperate the two strands. Now, to prevent rebinding, Single stranded binding proteins come and stabilize the DNA. This is followed by activity of primase which syntheisizethe RNA primer. Finally, DNA polymerase catalyzes the reaction by adding more nucleotides. And then, ligase joins the strands and completes the process.

Specialized head region is expected to be found in a member of the bilateral organisms.

Bilateral organisms are those that exhibit bilateral symmetry in which an imaginary line can be drawn from one end of the body to the other, dividing it into two roughly equal halves.

Bilateral organisms have several traits that distinguish them from other forms of symmetry. A specialized head region is one of the characteristics one would expect to find in a member of the bilateral.

Bilateral symmetry also allows for cephalization, or the concentration of sensory structures at one end of the body, often resulting in the formation of a head in animals.

Bilateral organisms are triploblastic, indicating that they have three germ layers: the endoderm, mesoderm, and ectoderm. These layers contribute to the differentiation of internal organs, connective tissues, and the nervous system.

Bilateral animals can be further classified into three subgroups based on the structure of their coelom and the presence or absence of a true body cavity: protostomes, deuterostomes, and acoelomates.

Segmentation and two tissue layers (diploblastic) are not the characteristics one would expect to find in a member of the bilateral.

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An example of a native perennial species with a daisy-like flower that makes a good cut flower is the Black-eyed Susan.

Perennials are flowering plants that live for more than two years. These plants' lifespan varies from plant to plant, and they may blossom once a year or several times throughout the year. Their lifespan is generally shorter than that of trees and shrubs; nonetheless, they are a crucial addition to any landscape.

Perennial flowering plants can serve as backbones in a garden, as well as providing an array of stunning and colorful flowers throughout the year.The flowers of the Asteraceae family are characterized as daisy-like flowers. Daisies, sunflowers, and zinnias are all well-known members of the family.

All of these plants have a unique floral structure, with a central disk and ray petals. Ray petals extend outward from the disk and are generally yellow or white.The Black-eyed Susan is a member of the daisy family and is a native perennial species that is commonly grown in gardens.

They are a reliable plant that blooms from late summer to early fall and has yellow, daisy-like petals with dark brown centers. It is ideal as a cut flower since the blooms are long-lasting and provide an elegant splash of color. The Black-eyed Susan's natural habitats are meadows, fields, and prairies.

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The following is not an important factor for passing the g1 checkpoint is social signals are present.

Social signals are not a factor in passing the G1 checkpoint, which is an important stage in the cell cycle. The other factors that are important for passing the G1 checkpoint are: adequate size, sufficient nutrients, DNA is copied, and DNA is undamaged. Adequate size ensures that the cell is large enough to support the processes that occur during the cell cycle.

Sufficient nutrients must be present to provide the energy required for cell division. DNA must be copied to provide genetic information to the new cell. Lastly, DNA must remain undamaged in order to ensure that the genetic information is accurate.

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The plasma membrane is a selectively permeable layer that allows certain substances to pass through it while preventing others from doing so. Gases such as oxygen and carbon dioxide are among the few that can cross the plasma membrane due to their selective permeability.

The plasma membrane is made up of phospholipids and proteins, which are organized in a bilayer structure. The phospholipid bilayer is primarily responsible for the membrane's selective permeability since it has both hydrophilic and hydrophobic parts. The hydrophobic tails of the phospholipids face inward, while the hydrophilic heads face outward. Due to the hydrophobic nature of the lipid bilayer, small non-polar molecules can pass through it without difficulty. This implies that large, non-polar molecules may have a tough time crossing the plasma membrane because of their selective permeability. Large polar molecules, glycoproteins, and ions, on the other hand, cannot pass through the plasma membrane due to their selective permeability since they are either too big or polar. The selective permeability of the plasma membrane is thus responsible for determining what substances can pass through it and what substances cannot.

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Succession is the process of change in the species structure of an area over time. As a result of succession, the gross primary productivity (GPP), net primary productivity (NPP) and biodiversity of an area can be greatly impacted.

GPP is the rate at which plants in an area produce biomass through photosynthesis. NPP is the rate of production of biomass that can be consumed by other organisms in the area. Biodiversity refers to the variety of species in an area.

NPP can also increase as more species become established, allowing for the transfer of biomass from primary producers to other organisms. Biodiversity also increases during succession as species become more diverse and complex. Ultimately, the process of succession affects GPP, NPP and biodiversity in an area.

Succession refers to the sequence of changes in plant communities that occur over time, resulting from natural or human-induced disturbances. These changes can lead to the replacement of one community with another, and they may alter the composition of the plant community, soil structure, and other ecosystem characteristics.

Gross primary productivity (GPP) is the total amount of energy that plants capture from the sun during photosynthesis. This energy is then used by the plant for its own metabolism and to produce organic matter that forms the basis of the food chain. GPP is important because it provides the energy needed for all other trophic levels in the ecosystem.

As a result, any changes in the plant community due to succession can have a significant impact on GPP.Net primary productivity (NPP) is the amount of energy captured by plants that is available for consumption by other organisms in the ecosystem.

NPP is calculated by subtracting the energy used by plants for their own metabolism (respiration) from the total energy captured during photosynthesis. NPP is therefore a measure of the amount of energy available to support herbivores, decomposers, and other organisms in the ecosystem.

The process of succession can impact NPP by altering the composition of the plant community and the availability of nutrients.Biodiversity refers to the variety of living organisms in an ecosystem. It includes the number of different species, as well as the genetic diversity within each species.

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These tests should be run with positive and negative controls to ensure accuracy and validity.

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Suppose you discover a mutant strain of spinach in which the thylakoid membranes are permeable to hydrogen ions (protons). The effect of this on the yield of ATP and/or NADPH during the light-dependent reactions will be that more ATP and fewer NADPH are generated. So, the mutant spinach would yield more ATP and less NADPH.

In photosynthesis, the thylakoid membrane's protons (H+) are pumped against their concentration gradient from the stroma of the chloroplast to the lumen of the thylakoid. It generates a proton gradient that is used to generate ATP and NADPH. During this process, the membrane is impermeable to protons, allowing them to build up inside the thylakoid's lumen.

ATP synthase, an enzyme complex that uses the proton gradient to generate ATP, is subsequently activated by protons flowing down the gradient.However, if thylakoid membranes are permeable to hydrogen ions (protons), this will cause the proton gradient to dissipate quickly, making it harder to generate NADPH. The amount of ATP produced during the light-dependent reactions would increase as a result of the higher proton flow.

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The alternate form of photosynthesis that uses the enzyme PEP carboxylase to fix carbon dioxide in mesophyll cells, which are arranged in parallel layers around bundle sheath cells, producing 4-carbon molecules is called C4 photosynthesis.

An enzyme is a type of protein that acts as a biological catalyst, accelerating chemical reactions that occur within living organisms. Enzymes facilitate these reactions by lowering the activation energy required for the reaction to take place. Enzymes are highly specific and typically catalyze only one type of reaction. They are involved in virtually all metabolic processes in living organisms, including digestion, respiration, and photosynthesis. Enzymes are essential to life and without them, most biochemical reactions would proceed too slowly to sustain life.

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Answer:

Explanation:

In Asexual reproduction, you don't need a partner. The "Asexual" Population can increase very rapidly.

Disadvantages:  It doesn't lead to genetic variation in a population. One person equals disease may affect all the individuals in the population.