1- why dong you usually get sick from the exact same pathogen twice
2-if a pathogen mutated so it had different antigens, would your memory B and memory T cells recognize it?
please help this is due at 3pm
1: For example, rhinovirus has over 100 different serotypes. Now, the good news is that you can't get ill from the same virus serotype right after getting better, due to the fact that you'll have developed antibodies which help to protect your immune system for a little while.
2:Most children in the United States are now vaccinated against measles virus; before vaccination was widespread, most were naturally exposed to this virus and suffered from an acute, unpleasant, and potentially dangerous viral illness. Whether through vaccination or infection, children exposed to the virus acquire long-term protection from measles. The same is true of many other acute infectious diseases: this state of protection is a consequence of immunological memory.
The basis of immunological memory has been hard to explore experimentally. Although the phenomenon was first recorded by the ancient Greeks and has been exploited routinely in vaccination programs for over 200 years, it is just now becoming clear that memory reflects a persistent population of specialized memory cells that is independent of the continued persistence of the original antigen that induced them. This mechanism of maintaining memory is consistent with the finding that only individuals who were themselves previously exposed to a given infectious agent are immune, and that memory is not dependent on repeated exposure to infection as a result of contacts with other infected individuals. This was established by observations made on remote island populations, where a virus such as measles can cause an epidemic, infecting all people living on the island at that time, after which the virus disappears for many years. On reintroduction from outside the island, the virus does not affect the original population but causes disease in those people born since the first epidemic. This means that immunological memory need not be maintained by repeated exposure to infectious virus
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A successful scion will produce the product of the rootstock with greater quality.
True
False
A successful scion will produce the product of the rootstock with greater quality. If you develop a particular flower which cannot be reproduced from seeds, it could be preserved by grafting.
brainliest?
TRUE or FALSE?
When reading the codon chart, you are supposed to use the tRNA anticodon to find the amino acid.
List the 3 things acceleration does.
Answer:
a change in velocity, a change in direction, or a change in both velocity and direction.
28) 6CO2 + 6H20 + (energy) → C6H12O6 + 602
What process is being shown in the chemical equation above?
Help
Answer:Photosynthesis can be represented using a chemical equation. The overall balanced equation is. ... Learn about the retirement process, managing your existing files, and alternative services at the Andrew File System Retirement Information ...
Explanation:
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Considering ethical questions is part of a marine scientist’s job. Part of being ethical is doing your homework and exploring all sides of an issue. Choose a current ethical issue in marine science, such as the use of genetically modified organisms (GMOs), conditions in fish farms, or another topic your instructor approves. Find two perspectives supporting one side of the ethical issue and two supporting the other. Be sure to use reliable sources, such as university web sites or newspaper/magazine articles. Create an outline with at least five points for each side. Then write a brief paragraph explaining what you believe an ethical choice around this issue is. Remember, ethical problems are difficult because both sides have valid points. Be sure to consider and discuss at least one point you think is valid from the side that you disagree with in your conclusion as you explain why your choice is the ethical one. Also, include a list of sources that you used. Two is the minimum for each point of view.
lo siento cariño, esto está fuera de mi alcance, los biloogistas marinos son geniales y me encanta ayudar, pero no puedo, lo siento mucho. como si realmente estuviera jodiendo como si apesta jaja quiero ayudarte pero no puedo
One current ethical issue in marine science is the use of genetically modified organisms (GMOs) in aquaculture.
What are genetically modified organisms?Genetically modified organisms (GMOs) are living organisms whose genetic material has been artificially altered in a laboratory using genetic engineering techniques.Here are two perspectives supporting each side of the issue:
Perspective 1: According to a report by the World Health Organization (WHO), GMOs have the potential to reduce the environmental impact of aquaculture by decreasing the need for wild fish as feed, reducing the use of antibiotics, and decreasing the risk of disease outbreaks.
Perspective 2: Opponents of GMOs in aquaculture argue that they pose a significant risk to wild fish populations and the environment. According to the Ocean Conservancy, GMO fish can escape from fish farms and breed with wild fish, potentially altering the genetic makeup of natural populations and harming biodiversity.
Therefore, use of GMO's is profitable as well as hazardous for the environment.
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Can someone please help me answer this question?
Answer: Are fur color and eye color in mice inherited traits?
I think.
Explanation:
In certain rats, black fur is dominant over white fur, If two rats that are both heterozygous for fur colored are mated, what would their offspring be expected to have?
Answer:
Three different genotypes and two different colors
Explanation:
Because both rats have heterozygous genes, meaning they have 2 different alleles, ex: "Yy") The offspring can have different genotypes and colors because the parents have heterozygous genes.
hope this helps!
The offsprings of the cross between two heterozygous rats will have the following genotypes: BB (black), Bb (black) and bb (white).
According to this question, a gene coding for fur color in rats is involved. The allele coding for black fur (B) is dominant over the allele for white fur (b). If two rats that are both heterozygous for fur are crossed i.e. Bb × Bb, gametes B and b will be produced by both rats. Using this gamete in a punnet square (see image), the following offsprings will be produced: BB, Bb and bb. BB - black offspringBb - black offspringbb - white offspringTherefore, the offsprings of the cross between two heterozygous rats will have the following genotypes: BB (black), Bb (black) and bb (white).Learn more at: https://brainly.com/question/3712307?referrer=searchResults
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Do either of your diseases in part A have the same pattern of inheritance as the model of the colorblindness mutation you made? How do you know?
what are the products of alcoholic fermentation ?
what are the products of lactic acid fermentation?
Answer:
alcoholic-- ethanol and carbon dioxide
lactic-- it produces lactate
Explanation:
In {external fertilization,
internal fertilization,
conjugation, or pollination}
mating partners come close to one another and release eggs and sperm.
Answer:
Explanation External fertilization is characterized by the release sperm and eggs into In fertilization protects the fertilized egg or embryo from predation an Ovoviparity is characterized by an organism retaining a fertilized egg
What seismic hazard is a form of structural failure?
Answer:Pancaking - shaking that causes a building's supporting walls to collapse and the upper floors to fall one on top of the other like a stack of pancakes.
Explanation:
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One of Jase's favorite hobbies is catching frogs. Lately, he 's also been studying a lot He about physical chemical changes. He understands that new substances are produced during a chemical change, but what happens during a physical change?
Answer:
On explanation
Explanation:
A physical change when objects or substances undergo a change that does not change their chemical composition, examples would include melting, transition to a gas, textural change, shape, size, color, volume and density.
The earth , the sun , and the seven other planets that are in orbit around the sun are part of the solar system. How does the size of the solar system compare with the size of the milky way galaxy ?
Answer:
Size of milky way galaxy is very large than our solar system.
Explanation:
The size of the solar system is much smaller than the size of the milky way galaxy because our solar system is a part of milky way galaxy. The radius of our solar system is 4.545 billion km while on the other hand, the radius of the milky way galaxy is 52,850 light years which is very very large than the radius of our solar system. Milky way galaxy has 100–400 billion planets while in our solar system has only eight planets.
Why does that pattern happen? (Hint: Think about what “cm per second” means.)
Answer:
It only moves a specific amount per second.
Explanation:
this is very vague because there was no context but you get the gist of it
Explain transformation in DNA
Do it for the points i will report
Answer:
it's the 2nd one
Explanation:
your welcome
What is a hominid? O A. Any ancestor of humans B. Any bipedal primate O C. Any species formed by evolution O D. Any bipedal animal
According to the research, the correct answer is Option A. A hominid is any ancestor of humans.
What is a hominid?They are the hominoid primates that include both humans and their closest relatives.
In this sense, in general, it is linked to the evolution of the human being, which is characterized by walking on two legs and upright and which belongs to the order of higher primates as the only species that survives.
Therefore, we can conclude that according to the research, the concept of hominid alludes to the human being as a single surviving species and its ancestors.
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Eukaryotic cells are somatic non-sex cells true or false
Answer: true
Explanation:
Of the alternate energy sources you have learned about, which one do you think is the most likely to become a part of our country's future. Why do you feel this way?
Answer:
probably water wheels
Explanation:
Once pollen lands on the stigma, it forms a pollen ____________________ down through the long_____of the pistil [the female reproductive part] into the flower's ______– which contains ovules. fill in the blank
Answer:
1. Pollen tube
2. Style
3. Ovary
Explanation:
This process is describing the process of POLLINATION, which is the transfer of pollen grains from the anther of a male flower (androecium) to the stigma of the female flower (gymnoecium). After pollination i.e. the pollen has landed on the sticky stigma, the pollen grows out a tube called POLLEN TUBE.
The pollen tube extends through the STYLE of the female flower called PISTIL to the OVARY. The ovary is the reproductive part of the female flower that produces the ovules, which the sperm in the pollen is about to fertilize.
What are the two categories that Igneous Rocks can be classified into?
How do you tell them apart?
Igneous rocks are divided into two groups, which penetrate or expand, depending on the strength of the molten rock.
Intrusive Igneous Rocks: Intrusive, or plutonic, is an empty rock that occurs when magma is trapped in the depths of the Earth.Extrusive, or volcanic, igneous rock is produced when magma exits and cools above the Earth's surface.hope it helps!
I need help asap... dont guess
Answer:
vfsewvfdcsewfcd
Explanation:
How are traces of ancient phytoplankton used to determine cooler and warmer water temperatures?
A. Chemical traces of phytoplankton that remain after millions of years are analyzed for data indicating water temperatures.
B. Climatologists analyze how much photosynthesis occurred after millions of years as an indicator of warmer water.
C. Large numbers of phytoplankton in fossil records after millions of years indicate warmer waters.
D. Fossil records indicate different species of phytoplankton prefer warm water to those that prefer colder water.
Answer:
c
Explanation:
i think
Answer:
A. Chemical traces of phytoplankton that remain after millions of years are analyzed for data indicating water temperatures.
Photosynthesis is the process by which plants
A. Turn CO2 into sugars B. Release CO2 to the atmosphere C. Turn sugars into CO2 D. All of the above
Answer:
D
Explanation:
Answer:
d. all of the above
Explanation:
ur welcome.
♨Answer the following questions on the basis of the given diagram.
1. What is shown in the diagram ?
2. Label A , B , C , D , E , G and H.
3. Write the name of the secretion of C , D and H.
4. In which part is digested food absorbed ?
5. Write in short about the digestion of food in ' C ' .
6. What is the function of F and G.
~Thanks in advance~ ツ
Answer:
1.The human digestive system.
2.A .mouth
b.oesophagus
C stomach
d.pancreas
e.small intestine(ileum)
f.rectum
g.appendix
h.liver
3.
4.in the small intestine.
5.
6.
Answer:
this is your answer.look it once.
Used for structural support and found in plant cells wood and natural fibers
A. Cellulose
B. Starch
C. Chitin
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Why are there two sets of phases during meiosis, but only one during mitosis? Think about what is different about meiosis and mitosis
Answer correctly or I will report
Answer:
Cells undergoing mitosis just divide once because they are forming two new genetically identical cells where as in meiosis cells require two sets of divisions because they need to make the cell a haploid cell which only has half of the total number of chromosomes.
Explanation:
20. A research company wants to design a new type of artificial heart valve that will be less likely to be rejected by a person's immune system. Which step in the design process should the company perform before building a prototype of the heart valve?
A. Find test subjects for the new heart valve.
B. Conduct research on existing artificial heart valves.
C. Determine how to manufacture the new heart valve.
D. Evaluate the performance of the artificial heart valve.
Answer:
C. Determine how to manufacture the new heart valve.
I think it seems a little obvious (I'm probably wrong)because obviously before doing something important your going to think about how to do it first.
The step in the design process that should the company perform before building a prototype of the heart valve is to determine how to manufacture the new heart valve. Thus, the correct option for this question is C.
What is meant by a Prototype?A prototype may be defined as a sample, model, or liberation of a product that is significantly built in order to test a concept or process. This term is used in a variety of contexts, including semantics, design, electronics, and software programming.
A prototype is typically utilized in order to determine a new design to increase precision by system analysts and users. If an organization or individual wants to design any type of structural and functional unit, they must require to know its actual mechanism of it.
Then they are allowed to manufacture the concept with regard to their discovery. So, a research company requires to demonstrate how to manufacture the new heart valve with the help of a prototype.
Therefore, the correct option for this question is C.
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Some vitamins are mostly found in animal-based foods, while some vitamins are abundant in plant-based foods. The best source of vitamin C is ____ , while ____ is naturally rich in vitamin B12. First blank: cheddar cheese, strawberries, lentils Second blank: fish, broccoli, peanut butter
Answer:
I did this for my test and had them correct
1. strawberries
2. fish
Explanation:
As per the given scenario, The best source of vitamin C is strawberries, while fish is naturally rich in vitamin B12. The correct option for first blank is B, and for second one is A.
What are vitamins?A vitamin is an organic molecule that is an essential micronutrient that an organism requires in small amounts for proper metabolism function.
Fat-soluble vitamins are stored in the liver, fatty tissue, and muscles of the body. Vitamins A, D, E, and K are the four fat-soluble vitamins.
Water-soluble vitamins do not accumulate in the body. Vitamin C and all of the B vitamins are among the nine water-soluble vitamins.
As per the given scenario, The best source of vitamin C is strawberries, while fish is naturally rich in vitamin B12.
Thus, the correct option for first blank is B, and for second one is A.
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