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
nika2105 [10]
3 years ago
15

Once you have been exposed to an antigen, you develop immunity against the same antigen because

Biology
1 answer:
Paha777 [63]3 years ago
3 0
Because an antibody is "made" relative to the antigen, but kept at low levels when you are exposed the first time ("primary immune response"). The second time you're exposed to the same antigen, memory cells recognize it and the body produces a high level of antibodies, and the level of antibodies usually remains higher for a longer time ("secondary immune response"). This is your basic immune response (primary and secondary).

This explains exactly why vaccines are effective to extremely effective.
You might be interested in
During meiosis, a defect occurs in a cell that results in the failure of microtubules, spindle fibers, to bind at the kinetochor
Aliun [14]

Answer:

Explanation:PRC1 accumulates on the central spindle in anaphase,

and suppression of PRC1 expression causes failure of microtubule interdigitation.

8 0
3 years ago
Read 2 more answers
Why is the ability of the cell membrane to be "picky" important?
Yuliya22 [10]

Answer:

Hi there!

Your answer is:

It is very important for the cell membrane to be <em>semi-permeable</em> because the ability to pick and choose what comes in and out of the cell keeps the cell safe! The membrane can choose to block out nasty germs and can also choose to get rid of internal waste.

An example of when this is important is in this scenario:

Let's say the cells are in a really salty solution. Naturally, salt will want to pull the water out of the cell. If the membrane <u>wasn't</u><u> </u> semi permeable, the water would listen to the salt and leave the cell. This would cause cell death. <u>BECAU</u><u>SE</u> the membrane is semi permeable, they can choose <em>not</em> to give the salt any water, keeping them alive

Hope this helps

5 0
3 years ago
Describe how plants determine the name of a biome
scZoUnD [109]
Climate is the main factor is determining<span> which </span>plants<span> can grow in a certain area, which in turn defines the </span>biome<span>. Temperature and precipitation are the two most important factors that </span>determine<span> a region's climate.

</span>
3 0
3 years ago
Read 2 more answers
Which items are sources of soil pollution or soil pollutants?
Wewaii [24]
Which items are sources of soil pollution
Answer:plastics
3 0
2 years ago
What is the difference between a dominant and recessive trait? How are each trait's symbolozed?
velikii [3]
The difference between a dominant trait and a recessive trait is that the dominant trait must have one copy of each from two different parent
Example: Brown Hair=H
Light hair=h
Hh is dominant because this is of a copy of each from two parents
A recessive trait must have two same copies coming from the same two parents
Example: HH
4 0
3 years ago
Other questions:
  • Sea starts eat by moving this organ outside their body A)lungs b) tongue c) teeth d) stomach
    14·2 answers
  • How does mantle convection cause seafloor spreading?
    14·1 answer
  • The stigma produces a sugary substance.<br> true <br> false <br><br> help please thanks : )
    15·1 answer
  • example of a decomposer and explain what would happen if decomposers were absent from a forest ecosystem
    9·2 answers
  • The effect of a hormone on a target cell may be decreased by the presence of ________.
    12·2 answers
  • In the 11th century, a Chinese scientist named Shen Kuo was one of the first people to develop a theory of Earth's changing land
    6·1 answer
  • Which statements are true of white blood cells? Check all that apply
    13·2 answers
  • Digestion of an unlabeled carbohydrate results in increased amounts of the monosaccharides glucose and galactose. Which is most
    13·1 answer
  • What is the best evidence to prove that Irene was heterozygous for hemophilia?
    8·2 answers
  • The diagram shows the life cycle of a dragonfly. Which stage in the diagram best shows that a nymph emerges from a fertilized eg
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!