Question

Which is an advantage of having memory cells when a pathogen is encountered for a second time.
A) The memory cells are what proliferate into clones of cells in response to the binding of an antigen.
B) Memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter.
C) Memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen.
D) It ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

Answer 1

The correct answer is option D

Reason -  The memory cells help is the following ways

a) When an antigen is present in the body, the memory cell attack to that antigen with in a very short duration than the time taken at the first counter

b) Large number of antibodies are produced during the second encounter of a virus  than at the time of its first encounter with the body

Answer 2

Answer:

D) It ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

Explanation:

It's D, I just took the quiz on usatestprep