1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
elixir [45]
2 years ago
9

What are the reasons for the several day delay in a primary response. Infection______. A. transport to secondary lymphoid tissue

B. antigen processing and presentation C. small initial # of lymphocytes specific for the antigen D. proliferation and differentiation.
Biology
1 answer:
Liula [17]2 years ago
7 0

Answer:

The correct answer is D. proliferation and differentiation.

Explanation:

Primary immune response occurs due to the first exposure of an antigen to the immune system. The primary immune response is generally delayed by many days because it takes time for B and T cells to become cloned and to proliferate and differentiate.

Then after several days of proliferation and differentiation of activated T and B cells, T cells become effector T cells and B cell becomes plasma cells which then eliminates the antigen. Memory B and T cells are also produced during this process which helps in generating a quick immune response during the second and subsequent exposure of that antigen.

So the correct answer is D. proliferation and differentiation.

You might be interested in
There are several cell types found in the plasma of our blood. which cell type is essential for forming clots that prevent us fr
maria [59]
I want to say the answer is Plasma

6 0
3 years ago
Pea plants heterozygous for flower position and stem length (AaTt) are allowed to self-pollinate, and 400 of the resulting seeds
7nadin3 [17]

Answer:

            AT             At           aT             at

AT      AATT        AATt       AaTT        AaTt

At        AATt         AAtt        AaTt        Aatt

aT        AaTT        AaTt        aaTT       AaTt

at          AaTt         AaTt        aaTt        aatt

The results of the punnet square show that one out of 16 offsprings will have both the qualities of having terminal flowers and being a dwarf.

A punnet square can be described as a diagram which depicts the likely outcomes of a cross. In the above punnett square, for the plants to have both terminal flowers and to be dwarf, both the alleles should be recessive for the traits.

7 0
3 years ago
The minimal amount of nutrients needed every day by healthy people to prevent nutrient deficiencies is called the
adelina 88 [10]
<span>The minimal amount of nutrients needed every day by healthy people to prevent nutrient deficiencies is called the RDA.
RDA stands for recommended dietary allowances. </span>RDA's are established by the Food and Nutrition Board of the National Academy of Sciences. There is a term RDI related to this. RDI stands for recommended daily intake.

6 0
3 years ago
List of foods that causes high cholesterol
lesya692 [45]
Canola oil, potato chips, cookies, other sugary treats, bacon, other processed meats, alcohol, milk, other conventional dairy products, refined grain products.
There are more but here are a few, hope this helps!
7 0
3 years ago
How do scientist today usually communicate their results and conclusions
Rudiy27

Scientists publish their results and conclusions in scientific journals.

8 0
3 years ago
Other questions:
  • Which of these is unique to flowering plants?haploid gametophytes,an embryo surrounded by nutritive tissue,double fertilization,
    7·1 answer
  • Evolution first came about in what year
    10·2 answers
  • The crystal size of an igneous rock is described as its
    12·2 answers
  • What biomolecules is an enzyme? what is the purpose of enzyme??
    15·1 answer
  • Which is a characteristic of something in the domain archaea?
    12·2 answers
  • The Hawaiian Islands are home to many endangered species. True or False?
    9·1 answer
  • Can someone figure this out please cus I'm totally lost on this one​
    15·1 answer
  • Prank text my sister, Something funny like Is this (name) and are ready ready for (something funny) or either text her something
    13·2 answers
  • What is true about the motion of chromosomes during binary fission?
    11·1 answer
  • Match these items to the correct being.​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!