Question

Why is it called cyclin?

1) Because its concentration rises and falls predictably as the cell cycle progresses
2) Because it controls the progression of the cell cycle
3) Because it is involved in DNA replication
4) Because it regulates the synthesis of proteins

Answer 1

Cyclin is so named because its levels cyclically fluctuate during the cell cycle, controlling the progress through various stages.Hence, the correct answer is option 2.

Step-by-step explanation:

The protein cyclin is named for its role in the cell cycle because its concentration rises and falls in a predictable pattern as the cell progresses through different stages. This fluctuation in cyclin levels helps the cell to know when to proceed to the next phase, thereby controlling the progression of the cell cycle. The levels of cyclins increase due to both external and internal signals and, once used, the cyclins from the previous phase are degraded.