Levels of Cyclin a are Highest During the Phase of the Cell

Question

Levels of cyclin A are highest during the phase of the cell cycle in which
A)The cell prepares to enter a quiescent state.
B)Mitosis occurs.
C)The cell is most responsive to mitogenic growth factors.
D)Cytokinesis occurs.
E)DNA replication occurs.

Accepted Answer

Cyclin A levels are highest during the S phase of the cell cycle, which is when DNA replication occurs. Cyclin A is crucial for the progression through the S phase and the initiation of mitosis.