According to the clonal selection theory, a an antibody...

According to the clonal selection theory, $a$ an antibody changes its shape according to the antigen it meets. $b$. an individual animal contains only one type of $\mathrm{B}$ cell. $c .$ the animal contains many types of $\mathrm{B}$ cells, each producing one kind of antibody. $d$. each $\mathrm{B}$ cell produces many types of antibodies. $e .$ many clones of antiself lymphocytes appear in the bloodstream.

According to the clonal selection theory, $a$ an antibody changes its shape according to the antigen it meets.
$b$. an individual animal contains only one type of $\mathrm{B}$ cell.
$c .$ the animal contains many types of $\mathrm{B}$ cells, each producing one kind of antibody.
$d$. each $\mathrm{B}$ cell produces many types of antibodies.
$e .$ many clones of antiself lymphocytes appear in the bloodstream.

Key Concepts

Clonal Selection Theory

Clonal selection theory is a fundamental concept in immunology that explains how a diverse repertoire of lymphocytes, each bearing a unique receptor, is generated before exposure to antigens. When an antigen enters the body, it binds to the lymphocyte that has a receptor specific to it, triggering that cell to proliferate and differentiate into effector cells and memory cells, ensuring a targeted and effective immune response.

Antigen Specificity

Antigen specificity refers to the ability of an immune cell, particularly a B cell or the antibodies it produces, to recognize and bind to a unique antigen structure. This concept is crucial for understanding how the immune system can distinguish between a vast array of different pathogens and ensure that only the matching lymphocyte is activated.

B Cell Diversity

B cell diversity is the phenomenon where an individual possesses a wide range of B cells, each with a unique B cell receptor generated through random genetic recombination. This diversity is essential for the immune system's ability to recognize and respond to an almost limitless variety of antigens encountered over the course of life.

Clonal Expansion

Clonal expansion is the process following antigen recognition, where the specific B cell that binds the antigen undergoes rapid division to produce many identical copies, all capable of targeting that specific antigen. This expansion is key to mounting an effective immune response against invading pathogens.

Self Tolerance

Self tolerance is the mechanism by which the immune system avoids attacking the body's own tissues. Within the framework of clonal selection theory, autoreactive lymphocytes are typically eliminated or rendered inactive during development to prevent autoimmune reactions, thereby ensuring that the immune system targets only non-self antigens.

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