SCID Is Defined by a Lack of Functional B and T

question 62

Multiple Choice

SCID is defined by a lack of functional B and T cells which eliminates protection by humoral and cell-mediated immunity.Which of the following is true?

• A)A genetic defect disrupts the development of the lymphocytic cell lines.
• B)A genetic mutation renders the individual incapable of removing a toxic DNA metabolite from lymphocytes, which ultimately destroys them.
• C)Genes coding for B and T cell receptors are mutated so the cells are incapable of binding antigens.
• D)Genes that code for interleukin receptors are mutated so the individual's B and T cells do not receive the activation signals, rendering them useless.
• E)All of the above describe cases of SCID.

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Definitions:

Investors

Persons or organizations that invest funds anticipating financial profits in return.

Expectations Theory

With respect to dividends: a dividend that’s lower than expected will be taken as a negative by investors even if it is larger than previous dividends. A variation on the signaling effect of dividends. With respect to interest rates: A theory explaining the shape of the yield curve. The curve slopes up or down depending on whether expectations about future interest and inflation rates are increasing or decreasing.

Signaling Effect

The signaling effect refers to the idea that actions by a company can provide information to investors about its future prospects.

Dividend Increase

An action by a company to raise the amount of money paid to its shareholders as dividends.