Which Statement Is True Regarding Lymphocyte Specificity

question 23

Multiple Choice

Which statement is true regarding lymphocyte specificity?

• A)Genetic rearrangement in the DNA that codes for antigen receptors results in up to 10 trillion permutations in the variable regions of B- and T lymphocyte-receptors.
• B)There is a different gene for every possible antigen that a lymphocyte may encounter.
• C)B lymphocytes have specificity for a large number of different antigens,however T lymphocytes can recognize only 500 antigens corresponding to the number of gene segments that code for the antigen receptors.
• D)B- and T cell-receptors are identical and both recognize up to 500 antigens corresponding to the gene segments that code for the antigen receptor variable regions.

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Definitions:

Mitosis

A process of cell division that results in two genetically identical daughter cells from a single parent cell, ensuring equal distribution of chromosomes.

ATP

Adenosine triphosphate, a molecule that stores and transfers energy within cells, facilitating many biological processes.

Active Transport

The movement of molecules across a cell membrane from a region of lower concentration to higher concentration, requiring energy.

Facilitated Diffusion

A process of passive transport, as opposed to active transport, where molecules move across a membrane with the assistance of transport proteins, without energy expenditure.