Which of the following does not describe B-cell receptors?Group of answer choicesB-cell receptors are membrane-bound and secretedB-cell receptors consist of a variable region and a constant regionB-cell receptors lack specificity and can bind to a number of different antigensB-cell receptors possess specificity and can therefore bind only to unique epitopes
Question
Which of the following does not describe B-cell receptors?Group of answer choicesB-cell receptors are membrane-bound and secretedB-cell receptors consist of a variable region and a constant regionB-cell receptors lack specificity and can bind to a number of different antigensB-cell receptors possess specificity and can therefore bind only to unique epitopes
Solution
The statement that does not describe B-cell receptors is: "B-cell receptors lack specificity and can bind to a number of different antigens."
Here's why:
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B-cell receptors are indeed both membrane-bound and secreted. They exist on the surface of B cells, but can also be secreted as antibodies.
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B-cell receptors do consist of a variable region and a constant region. The variable region is what allows them to bind to a wide variety of different antigens, while the constant region interacts with immune cells.
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B-cell receptors do not lack specificity. In fact, they are highly specific. Each B cell receptor is specific to one particular antigen.
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As mentioned above, B-cell receptors are highly specific and can therefore bind only to unique epitopes. This specificity is what allows the immune system to target and eliminate specific pathogens.
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