A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. How many picograms would be found at the end of S and the end of G₂?
A) 8; 8
B) 8; 16
C) 16; 8
D) 16; 16
E) 12; 16

Question

Quizplus · Accepted Answer

During the S phase of the cell cycle, DNA is replicated, doubling the amount of DNA in the cell. Therefore, at the end of the S phase, the DNA content would be 16 picograms. The G2 phase follows the S phase but does not involve a further increase in DNA content, so the DNA content remains at 16 picograms at the end of G2.

A Group of Cells Is Assayed for DNA Content Immediately