Q.12 - Biology

Question

A memory B cell can differentiate upon re-exposure to a pathogen of which cell type?

a. CTL

b. naïve B cell

c. memory T cell

d. plasma cell

Step-by-Step Solution

Answer

A memory B cell can differentiate into a plasma cell upon reexposure to a pathogen. Thus, the correct answer is option d. 

Introduction:

An antigen-specific T or B lymphocyte, which does not differentiate into effector cells during the primary immune response, however, which can instantly turn into effector cells upon reexposure to the same pathogen is known as a memory cell. 

Explanation:

CTLs or cytotoxic T lymphocytes perform an essential function in antitumor immunity and infections. The antigen-specific CTLs are an essential strategy in immunotherapy for several diseases. 

A B cell, which is not exposed to an antigen is known as a naïve B cell. 

An antigen-specific T cells, which stay long-term post an infection, and has been eliminated are the memory T cells. The memory T cells are converted into huge numbers of effector T cells upon reexposure to the particular invading antigen, thus, offering a brisk response to past infection. 

 

Thus, options a, b, and c are incorrect. 

 

The differentiated B-lymphocyte white blood cells, which possesses the tendency of secreting antibody or immunoglobulin are the plasma cells. 

The memory B cells are a kind of B lymphocytes, which forms a component of the adaptive immune system. A memory B cell upon reexposure to a pathogen can differentiate into a plasma cell. 

 

Hence, the correct answer is option d.