Explanation:
K.E = 1/2mv²
1/2 x 7.26 x 7.5²= 204.19j
How old can the earth be in 90001 years?
Answer:
90001 years old
Explanation:
Over 95% of incoming UV-B radiation is absorbed in the stratosphere. Please select the best answer from the choices provided
Answer:
True
Explanation:
The stratosphere is the layer of the earth’s atmosphere which is above the troposphere and below the mesosphere.
The stratosphere contains about 90 percent of the ozone layer. The stratosphere is made up of ozone layers which helps in the absorption of about 95 percent of the ultraviolet rays from the sun and converting to heat.
This is the reason why depletion of the ozone layer found in the stratosphere gives rise to global warming.
Answer:
true
Explanation:
Edge 2023
A. _____ found in the intestinal tracts of poultry and other animals; outbreaks have been linked to raw eggs, unpasteurized milk and raw or undercooked meat, poultry or shellfish; avoiding cross contamination can help prevent this microorganism from causing illness. B. _____ most often affects fetuses; outbreaks have been traced to unpasteurized milk, lunch meats and hot dogs. C. _____ found in infected cuts and in the nose and throat; outbreaks have been associated with mayonnaise based salads (macaroni, chicken, egg) and cream filled baked goods; can be prevented by proper cooling and refrigeration of foods. D. _____ found in the intestinal tracts or animals and humans; common cause of waterborne disease in humans in the United States. E. _____ found in the human intestinal tract; outbreak have been associated with salads and contaminated water; using sanitary practices can prevent illness from this microorganism.
Answer:
A Salmonella
B Listeria monocytogenes
C Staphylococcus
D Camplobacter jejuni
E Giardia intestinalis
Explanation:
The relevant term is mentioned above for filling in the blank according to the description provided. Each pathogen has a unique set of conditions required for breeding and causing infection, although some characteristics are overlapping with one another as well.
Organism found in the intestinal tracts of poultry as well as other animals, but can be prevented from causing illness by cross contamination is Salmonella.
organism that most often affects fetuses, and the cause of it is from unpasteurized milk is Listeria monocytogenes.
Organisms that can be found in infected cuts as well as in nose and throat is Staphylococcus.
microorganism that can be in the intestinal tracts or animals as well as humans which is common to waterborne disease is Camplobacter jejuni.
Microorganisms that can be found in human intestinal tract in which salads and contaminated water usually the cause of the outbreak is Giardia intestinalis.Microorganisms can be regarded as organisms that cannot be seen without microscope. Some of this organisms are dangerous fir our health while some are useful.Giardia intestinalis is one of the microbes found in human intestinal tract , it's outbreak could be as a result of contaminated water.Learn more at:
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Describe an example of non-heritable variation. Think about the way an organism interacts with its environment and how that influences its phenotype (the nurture in nature vs. nurture). Knowing what you do about genetics, genes, and gene expression control, propose a mechanism of molecular control that might be working in the example you have chosen.
Answer:
Epigenetic reprogramming
Explanation:
Epigenetic is a discipline that studies how phenotypic traits are influenced by DNA methylation and histone post-translational modifications such as acetylation, methylation and ribosilation. All these epigenetic marks are known to affect the conformation of the DNA molecule, thereby altering gene expression patterns and consequently also phenotypic associated traits. Epigenetic reprogramming refers to the erasure and remodeling of these epigenetic marks, this being a type of non-inherited variation produced by the interaction between a genotype and its environment. Epigenetic reprogramming is in part responsible for the non-heritable differences observed between different cell types and tissues.
The smooth endoplasmic reticulum functions in synthesis of:______.
A. Polysaccharides.
B. Proteins.
C. DNA.
D. Lipids.
E. Lipids, polysaccharides, proteins, and DNA.
Answer:
E. Lipids, polysaccharides, proteins, and DNA.
Explanation:
Hope it helps.
Which of the following elements has properties different:han the rest?
ОН
Ок
ON
ОО
1. Why did you use a pencil to mark the paper and not a pen? 2. Why do you have to use a different capillary tube for each sample? 3. Why is it very important in the amino acid chromatogram not to touch the paper with your fingers or hands? 4. If two samples have identical Rf values does this mean that they are necessarily identical molecules? Explain 5. What is your unknown? How do you know?
Answer:
a pencil can be erased if mistakes happenn/agerms can spreadWhat's DNA replication, and why is it an important part of cell division? Explain what semiconservative DNA replication is and how it is different from conservative and dispersive models of DNA replication. Name the five major enzymes involved in DNA replication and briefly explain their roles in the process. Discuss the differences between eukaryotic and prokaryotic cell division and DNA replication.
Answer:
Explanation:
1.In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule. DNA replication occurs in all living organisms acting as the most essential part for biological inheritance
2.Replication is an essential process because, whenever a cell divides, the two new daughter cells must contain the same genetic information, or DNA, as the parent cell. ... Once the DNA in a cell is replicated, the cell can divide into two cells, each of which has an identical copy of the original DNA.
3.In prokaryotic cells, there is only one point of origin, replication occurs in two opposing directions at the same time, and takes place in the cell cytoplasm. Eukaryotic cells on the other hand, have multiple points of origin, and use unidirectional replication within the nucleus of the cell.
If a shallow pan is filled with water, a drop of red ink is placed in one end of the pan, and a drop of green ink is placed in the other end, which of the following will be true at equilibrium?
a. The red ink will be uniformly distributed in one half of the pan, and the green ink will be uniformly distributed in the other half of the pan.
b. The red and green inks will be uniformly distributed throughout the pan.
c. Each ink will move down its concentration gradient.
d. The concentration of each ink will be higher at one end of the pan than at the other end.
e. No predictions can be made without knowing the molecular weights of the pigment molecules.
Answer:
b. The red and green inks will be uniformly distributed throughout the pan.
Explanation:
The inks distribute throughout the particles of water. It does not matter that one drop of ink was placed in one end, and the other on the other end. The constant movement and collision of particles make the ink's drop distribute uniformly in the pan. Besides, there will we a tendency to have the same amount of ink concentration in all the pan; to this, they have to distribute evenly.
Dichotomous keys ask open-ended questions about animal behavior. open-ended questions about easily observable characteristics. yes-or-no questions about animal behavior. yes-or-no questions about easily observable characteristics.
Answer:
The correct answer is
D. yes-or-no questions about easily observable characteristics.
Explanation:
just took the test from E D G E and got 100%
hope this helps :D
Yes-or-no questions about easily observable characteristics. So, the correct option is D.
What are Dichotomous keys?A dichotomous key is defined as a device designed by scientists to help its users identify a particular type of object and organism based on physical characteristics.
A dichotomous key is divided into two sections which usually contain specific questions with two options that are yes or no in each step. When a question is answered, the key directs the user to ask the next question until the user is able to correctly identify the name of the unknown organism.
Thus, Yes-or-no questions about easily observable characteristics. So, the correct option is D.
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Match the component of the midbrain with its function.
Involuntary motor commands to the erector spinae
Houses the superior colliculi
Site of neurons that produce dopamine
Motor axons from primary motor cortex to spinal cord
Answer:
Involuntary motor commands to the erector spinae: it is the tegmentum
Houses the superior colliculi: it is the tectum
Site of neurons that produce dopamine: it is the substantia nigra
Motor axons from primary motor cortex to spinal cord: cerebral peduncles
Explanation:
The tegmentum is an area of the brainstem involved in unconscious perception and reflexive commands. The tectum is localized in front of the tegmentum, which has been involved in motor responses such as, for example, walking, swimming (in fish), etc. The substantia nigra is a region of the ventral midbrain with a high concentration of neuromelanin in its dopaminergic neurons. The substantia nigra has been associated with Parkinson's and Huntington's diseases. Finally, the cerebral peduncles are two structures on each side of the brainstem that attach this component of the brain with the cerebrum. The cerebral peduncles have been involved with motor skills, balance and posture control.
The components of the midbrain and their respective functions are as follows;
The tegmentum: Involuntary motor commands to the erector spinae.The tectum: Houses the superior colliculi.The substantia nigra: Site of neurons that produce dopamine.The cerebral peduncles: Motor axons from primary motor cortex to spinal cord.Discussion:
The tegmentum is the portion of the brainstem responsible for unconscious perception and reflexive commands. The tectum is positioned in front of the tegmentum, which is responsible for motor responses such as, for example, walking, swimming (in aquatic life), etc. The substantia nigra is a region of the ventral midbrain with a high concentration of neuromelanin in its dopaminergic neurons. The substantia nigra has been associated with Parkinson's condition (As in Mohammed Alli). The cerebral peduncles have been involved with motor skills, balance and posture control.Read more:
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Michael, a new lab analyst, receives an email notifying him that his expected samples from a recent outbreak should be arriving soon. To prepare for his analysis, he decides to look into what type of diseases could be spread between animals and humans, as this is a new field for him. Michael has received limited information about the details of the outbreak from the epidemiologists that traveled to the site, but he does know that both animals and humans were infected by some type of virus. Michael looks through some of the lab manuals on how the samples will be handled once in the lab. While reading through these guidelines, he realizes that there are some terms he is not quite sure of.
Below are sentences that reflect the terms that Michael had to acquaint himself with while reading through the published guidelines from his laboratory. Please review the sentences below and fill in the blanks with the correct word(s).
a. arthropods
b. togaviruses
c. encephalitis
d. arbovirus
e. flaviviruses
f. zoonosis
A virus that is able to be transmitted via _________like ticks, flies, and mosquitoes is considered __________.
2. Some arboviruses are able to move through the bloodstream and infect the brains of humans and arbovirus animals. This disease manifestation is called __________.
3. A_______ is a disease that can be transmitted from animals to humans.
4 Several encephalopathies, such as Eastern equine encephalitis and West Nile virus encephalitis, are caused by the____________ These viruses can infect humans and and animals such as horses and birds.
Answer:
the correct option is:
A virus that can be transmitted through arthropods such as ticks, flies, and mosquitoes is considered an arbovirus.
2. Some arboviruses can move through the bloodstream and infect the brains of human and animal arboviruses. This manifestation of the disease is called encephalitis.
Explanation:
Arboviruses are very dangerous for humans, some do not generate painful bites, others are hematofogous (they feed on human blood) and others are nocturnal, which bite humans at night without their perceiving it.
Diseases of these viruses that are transmitted by vectors such as arthropods cause encephalitis, cardiac, pulmonary disorders, etc.
An example of this is the Chagas disease that is generated by the transmission of the Vinchuca arthropod.
Human activities, including the use of fossil fuels, have contributed to global
warming and the rise in sea levels. Both of these environmental changes are
threatening ecosystems and human communities worldwide. How could
scientists best cooperate to use scientific research to mitigate this problem?
A. They could look at trends in climate change to predict regions of
concern.
B. They could set regulations in their own countries to protect local
resources.
C. They could make personal choices that help reduce their carbon
footprints.
D. They could study climate change on other planets to predict its
effects on Earth.
Answer:
1 C when carbon footprint are reduced
It will reduce the rate of global warming
They could make personal choices that help reduce their carbon
footprints.
A carbon footprint is the total amount of greenhouse gases including carbon dioxide and methane that are generated by actions.What is carbon footprint?Carbon footprint, amount of carbon dioxide emissions associated with all the activities of a person or other entity like building. It includes- Direct emissions, such as those that result from fossil-fuel.
- Heating and transportation.
- Emissions required to produce the electricity.
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Hypoxia induces transcription of a DNA methyltransferase, DNMT1. What does this suggest about the relationship between hypoxia and regulation of gene expression
Answer:
Hypoxia is defined as an inherent condition of tumors that causes cancer development.
Hypoxia induces transcription of DNA methyltransferase, DNMT1 which suggest that hypoxia and regulation of gene expression have epigenetic relationship that refers to inheritable mechanisms responsible for regulating gene expression without altering the sequence of DNA bases.
DNA methylation is main epigenetic mechanism of Hypoxia.
a strand of dna contains the base sequence AGTT . What is the sequence of the complimentary strand of DNA
Answer:
The sequence is TCAA
Explanation:
Deoxyribonucleic acid (DNA) is a molecule composed of two complementary chains of nucleotides. The nucleotides are in turn composed of one nitrogenous base, one deoxyribose sugar, and one phosphate group. The four different types of nitrogen bases found in DNA are thymine (substituted by Uracil during RNA transcription), adenine, cytosine and guanine. These bases bind by complementary base pairing to form an antiparallel double-strand. The complementary base pairing rule states that thymine forms two hydrogen bonds with adenine, while cytosine forms three hydrogen bonds with guanine.
Answer:
TCAA
Explanation:
A matches to T and G matches to C.
Which statement is true of magnets?
A. A magnet always has two poles.
B. Earth is a permanent magnet. C. Electromagnets always have the same strength.
D. Electromagnets are generally weaker than permanent magnets.
Answer:
Option A
Explanation:
A magnet has always two poles.
1) North Pole
2) South Pole
However,
=> Earth is a temporary magnet.
=> Electromagnets don't have the same strength.
=> Permanent magnets are weaker than electromagnets.
FIGURE 20.15 Brain structure
The brain is structured in 3 parts: rombencephalon, midbrain and forebrain.
The robencephalon is a little evolved structure and therefore has a very simple and low complexity organization. It is divided into three parts: the medulla oblongata, the annular protuberance and the cerebellum. The robencephalon is responsible for functions that are basic and essential for our organism, in addition, that part of the brain is responsible for our movement. Despite being responsible for basic functions, injuries in any part of the brain can cause serious problems to the body.
The midbrain is responsible for conducting the motor and sensory impulses essential for the full functioning of our body. Its functioning is very important for the full functioning of the organism, without the midbrain, or with the impaired midbrain, the body may present abnormal and strange movements such as inflexibility, spasms and tremors,
The forebrain is the most evolved, developed and complex structure of the brain. It consists of the diencephalon, thalamus, hypothalamus and cerebrum. Due to its complexity, it is responsible for the most complex functions of the organism, being highly efficient and causing serious damage if it does not work properly.
Does this category
include producers?
Does this category
include consumers?
Archaea, bacteria, protists, viruses
Answer:
This group contains producers and consumers.
Explanation:
You can think of viruses as consumers that eat healthy cells in your body. Bacteria are producers, you can think of it like a lake with algee that grows and gets produced.
Assume that the following genes are mutated and completely lose their functions.What happens to the blood glucose levels after the affected individuals eat a glucose rich meal? Please explain.
a) The glycogen phosphorylase kinase gene
b) The glycogen synthase kinase 3 gene
Answer:
One of the essential post-translational regulatory mechanisms, which can influence the stability, activity, or localization of a protein is phosphorylation.
a) The phosphorylation of glycogen phosphorylase takes place by phosphorylase kinase. After phosphorylation, the glycogen phosphorylase gets stimulated and mediates the process of glycogenolysis. In case, if a mutation occurs in the phosphorylase kinase gene, the activation of glycogen phosphorylase cannot take place, and as consequence glycogenolysis will fail to take place.
b) The phosphorylation of glycogen synthase takes place by protein kinase A, also known as glycogen synthase kinase 3. After phosphorylation, the glycogen synthase becomes inactive and thus fails to mediate the process of glycogen biosynthesis. In case, if a mutation takes place in the protein kinase gene, the glycogen synthase enzyme will remain active all the time, and as a consequence, the process of glycogen biosynthesis takes place spontaneously.
What are the five senses? Type your brainstorm
Answer:
Sense: Smell, Taste, Touch, Sight, Hearing
Explanation:
Answer:
touch, sight, hearing, smell, taste
Explanation:
Touch is thought to be the first sense that humans develop, according to the Stanford Encyclopedia of Philosophy. Touch consists of several distinct sensations communicated to the brain through specialized neurons in the skin. Pressure, temperature, light touch, vibration, pain and other sensations are all part of the touch sense and are all attributed to different receptors in the skin.
Sight, or perceiving things through the eyes, is a complex process. First, light reflects off an object to the eye. The transparent outer layer of the eye called the cornea bends the light that passes through the hole of the pupil. The iris (which is the colored part of the eye) works like the shutter of a camera, retracting to shut out light or opening wider to let in more light.
hearing sense works via the complex labyrinth that is the human ear. Sound is funneled through the external ear and piped into the external auditory canal. Then, sound waves reach the tympanic membrane, or eardrum. This is a thin sheet of connective tissue that vibrates when sound waves strike it.
Humans may be able to smell over 1 trillion scents, according to researchers. They do this with the olfactory cleft, which is found on the roof of the nasal cavity, next to the "smelling" part of the brain, the olfactory bulb and fossa.
The gustatory sense is usually broken down into the perception of four different tastes: salty, sweet, sour and bitter. There is also a fifth taste, defined as umami or savory. There may be many other flavors that have not yet been discovered. Also, spicy is not a taste.
The canal connecting the third and fourth ventricles and running through the midbrain is the interventricular foramen
a. True
b. False
Answer:
this is false
Explanation:
Which of the following is the largest known gravitationally bound structure in the universe?
Which of the following is the largest known gravitationally bound structure in the universe?
Galaxy
Cluster
Solar system
Local Group
Answer:
Cluster
Explanation:
A cluster is the largest gravitationally bound object in the universe.
Answer:
Cluster
Explanation:
A cluster is the largest gravitationally bound object in the universe.
If there was complete (100%) selection against an uncommon deleterious recessive genotype (aa) in the human population, would you expect to observe much of an effect on the frequency of the a allele in your lifetime? Why or why not?
Answer:
Explanation:
Selection is used in identifying some important traits for improving on or elimination.
Selection against is when a selection does not favour a particular allele. If recessive allele is selected against there will be a reduction in the frequency of the allele.
Since it was complete selection against the frequency of the allele will move from its level of fitness to zero and the allele of the gene will be lost completely in the genome of the organism.
natural selection i.e selection done by nature is not enough to get 100% selection against because of the allele reoccuring in heterozygous form but with artificial selection by man it is achievable.
4: Units of inheritance known as genes exist in pairs.
a) TRUE
b) FALSE
5: A tall plant (AA) is crossed with a short plant (aa). The offspring produced in Fl will be
a) all Tall
b) short
c) y tall and 72 short
d) no of the above
6: The genotypes (or genotypic ratio) of the Fl offspring in 5 will be
a) all Aa (correct)
b) 12 AA, 12 Aa
c) aa
d) none of the above.
7: Alternate forms of genes are called alleles.
a) TRUE
b) FALSE
8: Phenotypes are
a) physical characteristics determined by genes
b) genes
c) genetic characteristics
d) alleles
9: The inheritance law known as the Law of segregation was postulated by
a) Mendel
b) Aristotle
c) Morgan
d) Darwin
10: Heterozygous organisms carry one dominant and one recessive allele
Answer:
4. a
5. a
6. a
7. a
8. a
9. a
10. True
Explanation:
4. Units of inheritance in living organisms are known as genes. These genes exist in pairs in all organisms and a copy of each gene is passed down to the offspring during reproduction.
Correct option: a
5. Assuming the dominance of allele A over allele a:
AA x aa
Aa Aa Aa Aa
All the offspring will appear tall since the effects of allele a is masked by allele A.
Correct option: a
6. From the cross in (5) above, the genotypic ratio of the offspring is 100% Aa.
Correct option: a
7. Alternate forms of genes in living organisms are known as alleles. A copy of the alleles is usually passed down to the offspring during the process of reproduction.
Correct option: a
8. Phenotypes are the physical appearance of organisms. They are physical interpretation of genes.
Correct option: a
9. The law of segregation was postulated by Gregor Mendel. It states that gene pairs segregate during the process of meiosis and then randomly unite during the process of fertilization.
Correct option: a
10 Heterozygous organisms have two different alleles for the same genes. For genes that obey Mendelian laws, heterozygous condition is characterized by one dominant and one recessive alleles.
What must happen before mitosis can begin?
Before the process of mitosis to be begin the chromosomes need to be duplicated, it happens during interphase.
What is mitosis?Mitosis is the procedure with the aid of which a mobile replicates its chromosomes after which segregates them, producing two identical nuclei in training for mobile division. Mitosis is generally followed by way of same department of the mobile's content material into daughter cells that have identical genomes.
The two phases of cell cycle are interphase in which DNA replication occurs, 3 stages of interphase are: G1 phase, S phase and G2 phase and mitotic in which division occurs phase. Mitosis occurs after the completion of DNA replication and doubling of chromosome number and cell contents and after mitosis, two daughter cells are produced of equal number of chromosomes.
There are total four steps of mitosis and these are: (i) prophase, (ii)metaphase,(iii) anaphase, and (iv) telophase. Anaphase of mitosis; during which phase of mitosis do nuclear envelopes and the nucleoli reappear etaphase of mitosis; prophase of mitosis; phases of mitosis; cell cycle.
Therefore, Before the process of mitosis to be begin the chromosomes need to be duplicated, it happens during interphase.
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ions but you do not want to increase the volume of the blood by reabsorbing large amounts of water from the filtrate. Assuming the aldosterone and ADH are both present, how would you adjust the hormones to accomplish the task
Answer:
Aldosterone and ADH are part of the renin angiotensin aldosterone system, this system is a system regulated by the kidney and lungs to be able to raise blood pressure.
Explanation:
This system is a retainer of liquids and water, to increase the blood volume of our body, in this way arterial hypotension is compensated.
Another mechanism with which blood volume can be increased is with the stimulation of thirst, and the need to ingest a liquid because of the dry mouth that our central nervous system perceives.
Both mechanisms prevent hypotension and dehydration.
A plant is a
A one-celled eukaryote
B one-celled prokaryote
C multicellular eukaryote
D multicellular prokaryote
the answer should be c hope this helps:)
Answer: A plant is a multicellular eukaryote
Explanation:
Animals plants, fungi and protists are eukaryote. All multicellular organism are eukaryote. Eukaryotes may also be single-celled.
The reactive chlorophyll molecule of photosystem primary is
A p600
B700
C 680
D 550
The reactive chlorophyll molecule in photosystem I is 700 and in photosystem II is 680. This number refers to the wavelength of the light it absorbs.
Why is it important to reduce demand for renewable resources?
A. To allow resources to be replenished naturally
B. To increase the need for recycling
C. To ensure that demand exceeds supply
D. To increase the price of resources
Answer:
A. to allow resources to be replenished naturally
Answer:
To allow resources to be replenished naturally
Explanation:
Because if u reduce the demand of renewable resources then the resources can increase/replenish naturally.
The mitochondrion, like the nucleus, has two or more membrane layers. How is the innermost of these layers different from that of the nucleus?
Answer:
The double membrane of the mitochondria is highly folded,and therefore wider when unfolded than that of the nucleus.This is an adaptive feature to increase the surface area for reactions (electrochemical gradient) by accommodating protons pumped into it by the proton motive force(PMF) from the matrix to set up the electrochemical gradients needed to generate the energy needed by ATPase synthase enzymes for ATPs synthesis.
Required number of protons needed to be accommodated by the double membrane to generate enough energy for ATPase synthesis,therefore larger surface area is needed.
Explanation:
Mitochondria is the powerhouse of the cell, which is a membrane-bound organelle found in the eukaryotic cell. The inner layer of the mitochondria has cristae, which is absent in the outer layer.
Mitochondria is a membrane-bound organelle, which is composed of outer and inner layers.
The inner layer has cristae or folds, which increases the surface area for an electrochemical gradient.
The cristae are separated by cristae junctions, which are juxtaposed to the outer layer of the mitochondria.
The inner layer helps in electron transport and ATP synthesis. The membrane is surrounded by the mitochondrial matrix, which helps in the transportation of protein complexes during the citric acid cycle.
Therefore, the inner membrane of mitochondria has cristae whereas, the outer layer lacks the folds.
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