Consider Two Proteins a and B with Equal Transcription and Translation

Multiple Choice

Consider two proteins A and B with equal transcription and translation rates. The mean lifetime of A, however, is twice as long as that of B. Starting with no protein, the time it takes for a protein to reach 99% of its steady-state concentration is …

A) the same for proteins A and B.
B) two times longer for A compared to B.
C) two times longer for B compared to A.
D) less than twofold longer for A compared to B.
E) less than twofold longer for B compared to A.