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 |