Question

Which of the following proteins, that is degraded during mitosis, actually appears during S phase of the cell cycle?

1) Cyclin A
2) Cyclin B
3) Cyclin D
4) Cyclin E

Answer 1

Cyclin D is the protein that is degraded during mitosis but appears during the S phase of the cell cycle. It plays a role in regulating the cell cycle and helps initiate DNA replication.

Step-by-step explanation:

The protein that is degraded during mitosis but appears during the S phase of the cell cycle is Cyclin D. Cyclin D is one of the proteins responsible for regulating the cell cycle and its levels fluctuate throughout the cycle. It acts in conjunction with cyclin-dependent kinases (Cdks) to phosphorylate key proteins and advance the cell cycle past checkpoints. During the S phase, Cyclin D accumulates and helps initiate DNA replication.