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Effectus [21]
3 years ago
10

Some viral diseases are dangerous only when a person is infected for the first time; subsequent infections produce only mild sym

ptoms or go entirely unnoticed. This pattern can be explained by the action of _____.
a. memory cells that trigger a secondary immune response
b. specific antibodies that remain concentrated in the bloodstream for life after the first infection event
c. memory cells that trigger a primary immune response
d. T cells that trigger a primary immune response
Biology
1 answer:
Mice21 [21]3 years ago
8 0

Answer:

a. memory cells that trigger a secondary immune response

Explanation:

Memory B and T cells are the long-lived immune cells that trigger a rapid and stronger immune response upon the subsequent encounter to a particular antigen.

Clonal selection in lymphocyte produces effector cell s and memory cells. If the same antigen or pathogen enters the body again, the already present memory cells stimulate a quicker and stronger immune response than the one generated during the first encounter. There are rapid proliferation and differentiation of memory cells into the effector and even more memory cells resulting in a vigorous immune response.

For example, during the first encounter with a pathogen, the proliferation of B cells produce antibody-producing plasma cells and memory B cells.

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In a group of muskmelon plants, some individuals have sour fruit and others have sweet fruit. in this group, the gene for the fr
juin [17]

Correct option(s):

(b) This muskmelon plant's genotype for the fruit taste gene is ff.

(c) This muskmelon plant is homozygous for the fruit taste gene.

A dominant allele is one that is capable of expressing itself even in the heterozygous condition and overshadows the effect of the recessive allele. It is usually denoted by a capital letter. Recessive allele on the contrary cannot express in presence of a dominant allele and is denoted by a small letter.

In the given case the fruit with a sour taste (phenotype) can have two possible genotypes (FF and Ff). The genotype of sweet taste is ff which is a homozygous condition.  

Note: Your question is incomplete, probably your complete question is “In a group of muskmelon plants, some individuals have sour fruit and others have sweet fruit. in this group, the gene for the fruit taste trait has two alleles. the allele F is for sour fruit, and the allele f is for sweet fruit. a certain muskmelon plant from this group has sweet fruit. this plant has two alleles for sweet fruit. Choose the correct option:

(a)  this muskmelon plant's genotype for the fruit taste trait is sweet fruit.

(b) this muskmelon plant's genotype for the fruit taste gene is ff.

(c) this muskmelon plant is homozygous for the fruit taste gene.”

Know more about Mendelian genetics here:

brainly.com/question/10189802

#SPJ4

7 0
2 years ago
Where is the urine stored before micturition from the body?
GaryK [48]
Urine is stored in the Bladder before it leaves the body.
8 0
4 years ago
Hello help please i’ll mark brainliest!!!
Licemer1 [7]

Answer:

I would say the second one.

Explanation:

I'm sorry if it's wrong

6 0
3 years ago
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What happens during the kerbs cycle
Damm [24]

Answer:

During the Krebs cycle, pyruvic acid is broken down into carbon dioxide in a series of reactions that give off energy. The high-energy electrons that are produced are picked up by a series of electron carriers, and the energy is used to convert ADP into ATP.

Explanation:

4 0
4 years ago
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Name the 4 main atmospheric factors that influence weather?
romanna [79]
Solar Distance:
The solar distance is the distance<span> between the Earth and the Sun. Since the Earth rotates, the distance changes. 
</span>
Air Pressure:
The air pressure/atmospheric pressure is <span>the pressure spent by the weight of the atmosphere. 

</span>Latitudinal Location:
the latitudinal location is used, with longitude, to specify the exact location<span> of features on the Earth surface. 
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Water presence:
The water presence is the existence of water. 

There are many factors that influence the weather but the 4 main ones are solar distance, air pressure, latitudinal location, and water presence. 

I hope this helps!
7 0
3 years ago
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