Which of the Following is the Inactive Form of Protein

Question

Which of the following is the inactive form of protein kinase A?
A) R2C2
B) R4C2
C) R2C4
D) R4C4
E) None of the answers is correct.

Accepted Answer

The inactive form of protein kinase A (PKA) is a tetramer composed of two regulatory (R) subunits and two catalytic (C) subunits, denoted as R₂C₂.