MCAT Question of the Day
    •

    Q:

    		 Terminal deoxynucleotidyl transferase (TDT) is an enzyme that does not require a template and can essentially add a random sequence of nucleotides to a DNA strand. B and T lymphocytes express the enzyme during development as a mechanism for having each cell produce a unique antigen receptor protein. Certain lymphocytes, however, lack TDT. Such lymphocytes would be expected to
    		 

    A

    		 have limited diversity of their antigen receptors.

    B

    		 employ DNA Polymerase III to generate diverse antigen receptors.

    C

    		 be especially susceptible to attack by foreign antigens.

    D

    		 be more short-lived in the blood due to stunted growth.



    Control of Enzyme Activity | Immune System |
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