Answer:
Invasion by the malaria parasite brings about extensive changes in the host red cells. These include loss of the normal discoid shape, increased rigidity of the membrane, elevated permeability to a wide variety of ionic and other species, and increased adhesiveness, most notably to endothelial surfaces. Now, sickle cells have membranes, stretched by their unusual shape, that become porous and leak nutrients that the parasites need to survive and the faulty cells eventually get eliminated quite fast by the organisms, destroying the parasite along the way.
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What it the difference between helper T cells and Killer T cells?
Answer:
Helper T-cells stimulate B-cells to make antibodies and help killer cells develop. Killer T-cells directly kill cells that have already been infected by a foreign invader.
Explanation:
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What would happen to the concentrations of atp, nadph and sugars if psi stopped working?.
Answer:
ATP will increase while NADPH and Sugar will decrease
Explanation:
Which cellular process most directly ensures the formation, growth, and repair of specialized tissues in multicellular organisms?
A. making energy in cells
B. storing of wastes in cells
C. division and growth of cells
D. exchange of gases in cells
Answer:
The answers is divison and growth of cells
Explanation:
The dna polymerase extends the primers into a new dna strand by.
Answer:
adding nucleotides one by one
Explanation:
A typical primer is about five to ten nucleotides long. The primer primes DNA synthesis, i.e., gets it started. Once the RNA primer is in place, DNA polymerase "extends" it, adding nucleotides one by one to make a new DNA strand that's complementary to the template strand.
When an action potential arrives at an axon terminal, it causes the opening of _______ channels, which triggers fusion of neurotransmitter vesicles with the cell membrane.
Answer:
calcium
Explanation:
When an action potential arrives at an axon terminal, it causes the opening of calcium channels, which triggers fusion of neurotransmitter vesicles with the cell membrane.
Clausen and colleagues proposed two hypotheses to explain this variation within a species: (1) There are genetic differences between populations of plants found at different elevations. (2) The species has developmental flexibility and can assume tall or short growth forms, depending on local abiotic factors. If you had seeds from yarrow plants found at low and high elevations, what experiments would you perform to test these hypotheses
A possible experiment to test these hypotheses would be to plant the seeds at different elevations and verify the differences in these.
What is an experiment?This is a scientific procedure that aims at testing hypotheses or potential explanation for a phenomenon.
What should be considered when designing a hypothesis?Make sure the factors tested can be measured.Control variables.Design an experiment that can test the hypothesis.What is the best experiment?There are two possible experiments:
Planting yarrow plants at different elevations and observing if their height is different.Genetics studies to determine if there are genetic differences.Learn more about experiments in: https://brainly.com/question/11256472
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A person dies from sudden cardiac arrest every _______ seconds.
Answer:
315.36 seconds
Explanation:
A person dies from sudden cardiac arrest every 315 seconds. This is a heart condition which results into unexpected stoppage of heart beats.
What is Cardiac arrest?Cardiac arrest is a condition in which the heart suddenly and unexpectedly stops beating. It is a medical emergency which without any immediate medical intervention, could result in sudden cardiac death of person within minutes. Cardiopulmonary resuscitation (CPR) is one method which could save the patient and possibly defibrillation are the needed treatments until further treatment can be provided to the patient. Cardiac arrest results in a rapid loss of consciousness in a person, and breathing may be abnormal or absent in this case.
Some of the most common causes of cardiac arrest involve an already underlying heart problem like coronary artery disease which decreases the amount of oxygenated blood supplying the heart muscles.
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Which of these makes a small blueprint
of DNA?
A. tRNA
B. ATP
C. mRNA
D. rRNA
Answer: mRNA
Explanation: it makes copies of dna before leaving the nucleus
The correct answer is option C.mRNA
Is mRNA a blueprint of DNA?
RNA (mRNA) carries the protein blueprint from a cell's DNA to its ribosomes, which are the "machines" that drive protein synthesis. Transfer RNA (tRNA) then carries the appropriate amino acids into the ribosome for inclusion in the new protein.
Is mRNA shorter than DNA?
Thus, the RNA molecules produced by transcription are released from the DNA template as single strands. In addition, because they are copied from only a limited region of the DNA, RNA molecules are much shorter than DNA molecules.
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During emerging adulthood, all body systems _____.
Answer:
function optimally.
Explanation:
During emerging adulthood, all body systems function optimally.
What is the IMA of the following pulley system? 1 3 4 2
Answer:
Explanation:
IMA Pully system is 3
10. What is a situation where mtDNA might be used? (1 point)
-when there is a large amount of nuclear DNA
-on the teeth and bones of skeletonized human remains
-on a victim who has just died
-when blood is present at the scene
Answer: On the teeth and bones of skeletonized human remains.
According to ernest hilgard, hypnosis is the result of __________. a. accepted roleplay between hypnotist and subject b. suggestions accepted by the conscious mind c. entrance into a special state of consciousness d. the effects of a "hidden observer" in the unconscious
According to Ernest Hilgard, hypnosis is the result of the effects of a hidden observer in the unconscious. Hypnosis is a state of loss of voluntary functions in the conscious state.
What do you mean by Hypnosis?Hypnosis may be defined as a state that corresponds to sleep but is caused by a person whose directions are readily accepted by the subject.
The hypnotic individual lacks the power of voluntary actions and is positively responsive to directions, suggestions, and reccomendation. Although, it is a state of consciousness.
Therefore, according to Ernest Hilgard, hypnosis is the result of the effects of a hidden observer in the unconscious.
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Answer: B. suggestions accepted by the conscious mind
Explanation: According to Theodore Barber, hypnosis is the result of suggestions accepted by the conscious mind
help anyone??
explanation:
Answer:
G. The star is cooler than a blue star
Explanation:
If the star the astronomer observed is similar in color and size to our sun, then it's impossible for it to be a white dwarf star because they are white and much smaller, while the star the astronomer observed had to have been some shade of yellow or orange and is similar in size to our sun.
A blue star is hotter than our sun by approximately 5000 kelvin. If the star observed is similar in color to our sun then we know that it hasn't reached a temperature hot enough to surpass a blue star, for colors of star change depending on temperature.
Our sun is not as bright as a red giant star. If the observed star was similar in color and size to the sun, then it couldn't have been as bright either.
There is no evidence that supports the star is farther away from other stars in the solar system.
Therefore, the option that makes the most sense is option G.
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The greatest health risk from food today is contamination via Multiple Choice parasites. prions. viruses and bacteria. fungi.
We can confirm that the greatest health risk from food today is contamination via viruses and bacteria.
Why are we at risk of contamination from these sources?Viruses and bacteria are the greatest threat to humans at the current time, as far as food contamination. These organisms are microscopic and thrive in many of the most common human foods. While parasitic infections are rare and fungi can often be spotted on food, viruses and bacteria are nearly impossible to notice and much more common in food.
Therefore, we can confirm that the greatest health risk from food today is contamination via viruses and bacteria.
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Although the world is seeking to slow the pace of climate change, preserve wildufe, and support billions of people, deforestation continues. Between 1990 and 2016, the world lost 502,000 square miles of forest. In the well-known Amazon rainforest, about 17 percent of the trees have been destroyed over the past 50 years, with recent losses on the rise. What are some effects on the environment you'd expect to see from deforestation? Select ALL that apply.
A) enrichment of soil for better farmland
B) climate change resulting in global warming decreases in species diversity and richness
D) allows for more plant life to flourish with the removal of tree canopy
E) erosion due to heavy rains causes loss of habitat causing animal migration
Answer:
B) climate change resulting in global warming, C) decreases in species diversity and richness, and E) erosion due to heavy rains causes loss of habitat causing animal migration
Explanation:
Deforestation causes global warming which results in decrease of species diversity and richness and also results in soil erosion.
What is Deforestation?"Deforestation refers to the decrease in forest areas across the world that are lost for other uses such as agricultural croplands, urbanization, or mining activities."What is global warming?The rise of earth's normal temperature is called global warming. It is an effect of greenhouse gases and deforestation.What is soil erosion?Removal of top layer of soil is called soil erosion.Due to deforestation large no. of trees have been cut down and when heavy rainfall occurs there is no roots of tree to hold soil.Hence, the correct option is both B and E.
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Fossils that have characteristics common to both an ancestral species and descendent species are called.
A person who suffers from phenylketonuria (PKU) is unable to process phenylalanine because of a dysfunctional ______, a protein that is encoded by their DNA.
Answer:
enzyme
Explanation:
Enzymes are a type of protein.
Answer:
Enzyme
Explanation:
A person who suffers from phenylketonuria (PKU) is unable to process phenylalanine because of a dysfunctional enzyme, a protein that is encoded by their DNA.
Based on the data in Table 1, complete the cladogram using the template provided to indicate the evolutionary relationships of the four species: African elephants (Loxodonta africana), Asian elephants (Elephas maximus), woolly mammoths (Mammuthus primigenius), and dugongs (Dugong dugon)
The cladogram will show that the African elephant and the Asian elephants are the most related species while the dugong is the least related species with the rest.
What is a cladogram?A cladogram is a pictorial illustration in the form of a branching tree which illustrates evolutionary relationship between species of oraganisms.
The four species under consideration are as follows:
African elephants (Loxodonta africana),Asian elephants (Elephas maximus),woolly mammoths (Mammuthus primigenius), anddugongs (Dugong dugon)A cladogram showing evolutionary relationship between the species will show that the African elephant and the Asian elephants are the most related species as they most recently evolved from a common ancestor.
The dugong is least related while the woolly mammoth share a common evolutionary relationship with them.
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At the site of infection, leukocytes are stimulated to express ________, which causes them to attach to the endothelial cells before moving into the vessel wall.
Answer:
integrins
Explanation:
At the site of infection, leukocytes are stimulated to express integrins which causes them to attach to the endothelial cells before moving into the vessel wall.
We consider both mineral resources and energy resources to be resources, many of which have a geologic origin.
a. True
b. False
Answer:
Don't count on me but I would say B. False
Explanation:
Hope I am right
Importance of carbon cycle
Answer:
The carbon cycle explains how carbon moves from one resource to another on the planet. This cycle is critical for the Earth's temperature and carbon balance to remain stable.
Explanation:
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What occurs at the ATP synthase?
Answer:
Phosphorylation of ADP, i.e. ATP synthesis
Explanation:
Long answer: The protons from the inter-membrane space flow into the matrix of the mitochondrion through ATP synthase. As they are moving down the concentration gradient, energy is released and this is used by ATP synthase to phosphorylate ADP, i.e. add inorganic phosphate to ADP in order to create ATP.
Billy loves to eat raw seafood and does so frequently. As a result, Billy runs the risk of suffering from: a. botulism b. rashes c. hemolytic-uremic syndrome d. parasitic infection e. bovine spongiform encephalopathy
Given what we know, we can confirm that by eating raw seafood, Billy runs the risk of contracting a parasitic infection.
What is a parasitic infection?Parasites are organisms that live inside another organism, this second organism is known as the host. The parasite steals nutrients from the host in order to survive, this often results in the death of the host if the parasite is not combated. These parasites are common amongst fish and are why Billy is at increased risk of parasitic infection by eating raw seafood.
Therefore, we can confirm that by eating raw seafood, Billy runs the risk of contracting a parasitic infection.
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by the time the fertilized egg implants in the uterus it has become a collection of hundreds of cells called
zygote I think is the answer
Why is daily muscle strengthening activity not recommended?.
Daily muscle training is not recommended as it will lead to injury and fatigue.
Why does daily training lead to injury?Muscle training is an intense activity for your muscles. Training every day can cause injuries such as muscle tears or tendonitis from overusing the muscle in an intense manner for too long. For this reason, it is best to allow the muscle to rest at least one day before attempting to train again or undergoing intense activity.
Therefore, we can confirm that daily muscle training is not recommended as it will lead to injury and fatigue due to overusing the muscle in an intense manner.
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15. Electromagnetic radiation is generated by stars
and has wavelengths and frequencies that
contribute to each wave's special
characteristics. Many different types of
telescopes are used to study these phenomena
so that scientists can get a better picture of our
universe. Which telescope would be used to
detect temperature signatures left behind by
ancient stars?
18. Mary is making a computer model comparing
the rotation of Earth to the rotation of the Sun.
What information should be included in the
model?
A. radio telescope
B. infrared telescope
C. reflecting telescope
D. refracting telescope
Answer:
B
Explanation:
PLEASE HELP!!!! need the question answerd asap!!
Answer:
I thinked it only for algebra
PLSSSS HELP MEE
6) lohn uses dog treats to train suis dog, Jack, to sit and stay. When his dog performs an action correctly, John gives Jack a treat. This is an example of
A) a reflex behavior.
B) conditioned behavior.
C) observational behavior.
D) a dog's social behavior
Answer:
Its A
Explanation:
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Mendel crossed a true breeding yellow seed pea plant with a true breeding green seed pea plant and the resulting F1 offspring were all ____________.
The resulting F1 offspring of a cross between a true breeding yellow seed pea plant with a true breeding green seed pea plant is 100% yellow.
What is Mendelian cross?Gregor Mendel is referred to as the father of genetics because of his immense contribution to inheritance.
He crossed a dominant yellow pea plant with a recessive green pea plant as follows:
YY (true breeding yellow seed) × yy (true breeding green seed)
The F1 offsprings (Yy) will all possess yellow seeds because yellow trait is dominant over the green.
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Which molecule do mammals use to store extra glucose?
Lipids
Proteins
Nucleic Acids
Carbohydrates