A group of scientists is studying the internal parts of a cell. Which microscope is most appropriate for these scientists to use?

Answer:

d

Explanation:

passive transport needs no energy W when transporting from high to low and need energy when transporting from low to high

Cellular transport that does not require cellular energy is the example of passive transport. The correct option is B.

Passive transport is a type of membrane transport in which substances are moved across cell membranes without the use of energy.

Differing from active transport, the one that uses cellular energy to move substances across cell membranes, passive transport utilizes the second law of thermodynamics to move substances across cell membranes.

Passive transport processes play critical roles in homeostasis. They maintain normal conditions within the cell and the organism as a whole by allowing substances to move into and out of the cell.

Active transport is defined as the movement of a solute from one side of the cell membrane with a low electrochemical potential to the opposite side with a higher electrochemical potential.

Thus, the correct option is B.

For more details regarding passive transport, visit:

https://brainly.com/question/13542102

#SPJ6

Answer:

a

Explanation:

coral reef that has lost a significant number of its species due to water pollution

A coral reef that has lost a significant number of its species due to water pollution best be described as a biodiversity hotspot, hence option A is correct.

This is so that fish, crustaceans, and other living things have a place to dwell thanks to coral reefs. They are more ecologically diverse than rainforests. And ecosystems depend on biodiversity for food, health, and resilience. Similar to a soccer team without a defense is a loss of biodiversity.

Many people think coral reefs contain greater biodiversity than any other environment on the earth, even more than a tropical rainforest. More than 25% of all marine life lives on coral reefs, which make up less than 1% of the ocean floor.

Therefore, a coral reef that has lost a significant number of its species due to water pollution best be described as a biodiversity hotspot.

Learn more about biodiversity, here:

https://brainly.com/question/14854468

#SPJ2

Answer:

Corn oil has a density of 0.7 g/cm3. Water has a density of 1.0 g/cm3. A piece of plastic with a density of 0.9 g/cm3 will sink in corn oil and float to the top of the water.

Explanation:

Density is a unit that let us know the quantity of mass that a substance has per unit of volume. In a solution, the component with lower density will float, and be on the surface.

If we compare the densities of corn oil and a piece of plastic, the plastic will sink because its density ( 0.9 g/cm³ )is higher than the one of the corn oil (0.7 g/cm³).

In the case of the water, the plastic will float to the top because its density ( 0.9 g/cm³) is lower than the one of water (1.0 g/cm³).

Answer:

Direct

Explanation:

Direct current flows in one direction are often referred to as unidirectional (uni- one, directional -direction). Whereas, other current flows typically can reverse the flow from time to time which is present in case of Alternating current flow

Direct

For more information:

https://brainly.com/question/2424523?referrer=searchResults

Answer:

B. Monoclonal antibodies are produced from plasma cells

Explanation:

An antigen is a molecule present on the surface of a pathogenic organism and they are capable of generating an immune response by binding to specific antibodies (immunoglobulins) that are secreted by lymphocytes B cells of the immune system. B cells are a type of white blood cell that plays key roles during humoral immunity of the adaptive immune system. When an antigen is introduced into the organism, a specific lineage of B cells proliferate, in a process known as monoclonal expansion.

Organic compounds are composed mostly of carbon atoms.

Organic compounds make up life.

Answer:

The wave like motion of a tube.. generally oesophagus due to which, food goes down

Explanation:

peristalsis have alternative contraction and relaxation movements

Answer:

B. substitution

Explanation:

Answer:

Explanation:

According to the nutrition between the fox, the rabbit and the lettuce, it can be concluded:

-All three belong to the food chain of a specific region.

-The lack of any, would make the chain unbalanced, breaking it.

-The fox is a carnivore, so it feeds on the rabbit. While the rabbit is     herbivorous, it feeds on plants.

-The rabbit and the fox are mammals, while the lettuce belongs to the Asteraceae family.

Answer:

Amount of protein required = 48 gram

Explanation:

Given:

Adult required = 0.8 gram protein per kg

Weight of women = 60 Kg

Find:

Amount of protein required

Computation:

⇒ Amount of protein required = Total body weight × 0.8 gram protein

⇒ Amount of protein required = 60 × 0.8

⇒ Amount of protein required = 48 gram

Answer:

through the process of endocytosis or phagocytosis,

Answer:

Amoeba Obtain Its Food By

Amoeba envelops its food through the process of endocytosis or phagocytosis, where pseudopodia is created by flexibility of the plasma membrane. ... Amoeba takes in food using temporary finger-like extensions of the cell surface which fuse over the food particle forming a food-vacuole

Explanation:

Good luck ..... Brainliest please

Explanation:

A is 6H2O

B is C6H12O6

C is 6O2

Answer:

a The pulmonary artery carries deoxygenated blood.

Explanation:

This is the the only artery that transports deoxygented blood in mammals. specifically it carry deoxgenated blood from the the atria  to the pulmonary circulation. That is to the lungs  for the exchange of the C02 in the deoxygenated blood with oxygen  in the lungs.

The  blood thus become oxygenated,and therefore return through the pulmonary veins to the left ventricle.

From the left ventricle ,through ventricular systole,blood is empty into the aorta through the aortic valves into the  systemic circulation.

Although,they carry blood away from the heart,but the blood is de oxygenated instead of the usual oxygenated by arteries,They are still regarded as arteries  because of convey of blood away from the heart,a typical role of arteries

Answer:

Fusion power is a proposed form of power generation that would generate electricity by using heat from nuclear fusion reactions. In a fusion process, two lighter atomic nuclei combine to form a heavier nucleus, while releasing energy. Devices designed to harness this energy are known as fusion reactors.

Answer:

Peas were an ideal choice for Mendel to use because they had easily observable traits there were 7 of which he could manipulate

The main reason why Mendel used a pea plant rather than anything else was because a pea plant had observable traits that could be easily recognized. Seven, in particular, he could manipulate in his experiment. Finally, he would cross-pollinate the peas and study each trait that passed on from one pea to another.

Best of Luck!

Answer and Explanation:

a) What group of lipids do oils and fats belong to? Lipids and fats belong to the triglyceride group. Triglycerides are a mixture of glyceride esters and fatty acids. They are stored in specialized adipose cells, known as adipocytes. Adipocytes give a place to the adipose tissue in the organism.  

b) How can we differentiate oils from fats at room temperatures, around 20 ° C? At room temperature, fats can be recognized for being solid, while oil is liquid.

c) Many seeds, such as soybeans, store relatively large amounts of oil. What is the importance of the presence of oil for the embryo of oil seeds? The plant´s embryo needs to nurture while it is developing. The oil in the seeds plays the role of nutritive storage, together with other nutritive substances. These are used by the plant until it is able to photosynthesize.

d) Birds and mammals store fats in adipose tissue, under the skin. What is the advantage of the fatty layer under the skin being especially developed in animals that live in cold climates, such as polar bears? The advantage of the fatty layer under the skin is to keep or maintain the animal´s temperature. It is very common to find a thick fatty layer under the skin of animals that live in very cold environments, such as polar bears or deep divers marine mammals.

e) Recent studies indicate that fat is associated with cardiovascular disease. Name another substance in the lipid group also commonly associated with these diseases. Cholesterol is a fatty substance needed for the good functioning of the organism. It is part of cellular layers and it plays a role in hormone synthesis and biliary salts. Although in excess they might be harmful as they tend to accumulate in the artery´s walls, blocking the passage of blood. This can lead to a heart attack.

Answer:

The correct order of events when RER delivers transport vessicles to the Golgi apparatus are;

4,2,1,3

Arrival at a cisterna known as the cis face."

Enzymatic modification occurs.

Small vesicles move material from one cisterna to the next.

Arrival at the trans face.

Explanation:

Rough endoplasmic recticulum are flat sacs in the cytoplasm that help in the synthesis of protein. It vesicle or sac floats through the cytoplasm to the Golgi apparatus and is absorbed. The Golgi apparatus is an organelles in the cytoplasm that help to package protein into membrane bound organelle in the vessicles.

The vessicles that bud off join to the rough endoplasmic recticulum, Molecules travel through the Golgi apparatus through the vesicle transport till they get to the end of the assembly line at the biggest sacs from endoplasmic recticulum called the trans-Golgi.

Firstly, the particles arrive at cisterna known s Cis face. The cis face is the end of the organelle where substances enter from the endoplasmic reticulum for processing into the Golgi apparatus.

Then there is enzymatic modifications which is done by the activities of enzymes.

Small vessicles then Transport material from the cisterna.

It is then transported to the trans face. The trans face is where the particles leave in the form of smaller detached vesicles.

Answer:

Mainly the root nodules serve as a home for nitrogen fixation

Explanation:

Answer:

skin cancer

Explanation:

because a human skin system is not evolved to handle the harsh conditions invoked by ultraviolet rays

Answer ; A

Idiosyncratic reactions are unpredictable and not explained by the pharmacologic properties of the drug. An example is the individual with infectious mononucleosis who develops a rash when given ampicillin.

Definition. Idiosyncratic drug reactions are adverse drug reactions that do not occur in most patients at any dose and do not involve the known pharmacological properties of the drug.

Answer:

Its actually A

Explanation:

Answer:

As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level.

Explanation:

Thin air exerts less pressure than air at a lower altitude.

Answer:

This simply refers to photolysis of water.

Explanation

Generally,two steps are involved in photosynthesis.

The light  dependent stage or light reaction,(which is the first part of photosynthesis,

The light independent stage (which is the second part.)

The light independent reactions involved the trapping of sunlight by the photo systems, in the leaves,and the splitting of the water molecules by sunlight.

          H20 + Sunlight → 1/2H+ +2 e- +1/2 O2.

The  movement of electron can be cyclic or non cyclic photophosphorylation, In Cyclic, photo system 1 absorbs  the electrons and pass these to the primary pigments in the leaves. This excited the electron  in chlorophyll molecule to higher energy levels , The electron emitted from the leaves is by a process called by photoactivation The emitted electron do not return to the photosystems,rather they are pick up by the primary electron acceptors  and returned to the chlorophyll molecules by electron carriers,NADP.

During this process Energy is released for ATPase synthase of  ATP for phosphorylation of ADP with phosphate,

In Non-cyclic photophorylation,photosystem I and II  absorbs the electrons as Z-scheme  movement of electrons.,Photoactivation  of chlorophyll takes place as in the Cyclic.The primary electron acceptors  takes the  excited electrons  to move along the chain of electron carriers.This makes the photosystems positively charged.

Hence to regain stability the primary pigment of photo system 1 takes electrons from photosystem II.To replace its lost electrons, P II takes electrons from the photolysis of water.ATP is generated  as the carriers molecules transport electrons from the energy produced.

The hydrogen ions is used for the production of electrochemical gradients,which supplies the energy used by the ATPase synthase for the ATPs production.The process is called chemiosmosis. It  involved the  transports of H atoms by NADPH into the stroma,and the splitting of these into protons and electrons,The electrons  form ETC,which forms the PMF.The latter  pumped protons  into the thylakoid membrane,and as this returns it  generate the electrochemical gradient.

The ATP is used in the Calvin Cycle for CHO,proteins productions,

Answer:

Down syndrome occurs when the nondisjunction occurs with Chromosome 21. Meiosis is a special type of cell division used to produce our sperm and egg cells.

4.) Mitochondria and Chloroplasts are much larger than prokaryotic cells.

no, they are about the same size, another good argument for the endosymbiotic theory is the presence of prokaryotic ribosomes (30S)

The statement that does not support the endosymbiotic theory is:

4.) Mitochondria and Chloroplasts are much larger than prokaryotic cells.

Lynn Margulis, in her endosymbiotic theory, proposes that eukaryotic cells evolved by incorporating prokaryotic organisms into their cytoplasm.

This theory is reinforced by the following facts:

Therefore, we can conclude that Mitochondria and Chloroplasts are much larger than prokaryotic cells is the statement that does not support the endosymbiotic theory.

Learn more about endosymbiotic theory here: https://brainly.com/question/2392639

Hello. This question is incomplete. The full question is:

Study the diagram of the geologic time scale. Which method is most likely used to identify what happened before the start of the Paleozoic era?

a. Scientists study fossils from the Jurassic period.

b. Scientists observe index fossil records of the Mesozoic era.

c. Scientists examine fossil evidence during the Precambrian time.

d. Scientists explore the emergence of mammals and humans in the Cenozoic era.

Answer:

c. Scientists examine fossil evidence during the Precambrian time.

Explanation:

As you may already know, to facilitate the study of the geological periods of the earth, scientists, especially geologists, decided that the history of the earth should be buried in eras, periods and geological periods, so that the studies could be done in more specific and organized way.

The geological era before the Paleozoic era is the Precambrian period. During this period, there were forms of life on earth that generated fossils that allow scientists to record, date and understand this period, in addition to being able to relate it to others. Thus, the method most likely used to identify what happened before the beginning of the Paleozoic era would be to examine fossil evidence during the Precambrian period.

Answer:

c. Scientists examine fossil evidence during the Precambrian time.

Explanation:

edge 2021

Answer:

The correct answer would be -

Membrane A - Hypotonic solution - the movement of water towards inside the cell

Membrane B - Isotonic soltion - there will be no movement of water

Membrane C - Hyertonic solution - the movement of water towards outside of the cell

Explanation:

This experiment deals with tonicity as this solution will affect the tonicity of the egg membrane. In membrane A there are more solutes inside the cell than outside the cell so it is hypotonic solution so the movement of water will be towards inside the cell.

In membrane B the solutes are equal in both sides so there will be no movement as its isotonic condition while in membrane C the solution is in hypertonic situation as the solutes are more outside than inside.

Thus, the behavior of the membranes are-

Membrane A - Hypotonic solution - the movement of water towards inside the cell

Membrane B - Isotonic soltion - there will be no movement of water

Membrane C - Hyertonic solution - the movement of water towards outside of the cell

Answer:

Polymer means many monomers. Sometimes polymers are also known as macromolecules or large-sized molecules. Usually, polymers are organic (but not necessarily). A monomer is a molecule that is able to bond in long chains.

Explanation:

Answer:

Humans lack DNA in their brain cells.

Explanation: