Question

what is cell cycle? Discuss the mechanism of its molecular control ?​

Answer 1

Explanation:

Positive Regulation of the Cell Cycle

Two groups of proteins, called cyclins and cyclin-dependent kinases (Cdks), are responsible for the progress of the cell through the various checkpoints. The levels of the four cyclin proteins fluctuate throughout the cell cycle in a predictable pattern

Answer 2

Answer:-

What is cell cycle:

• A cell cycle is a series of events that takes place in a cell as it grows and divides.
• A cell spends most of its time in what is called interphase, and during this time it grows, replicates its chromosomes, and prepares for cell division.
• The cell then leaves interphase, undergoes mitosis, and completes its division.

Mechanism of its molecular control:

1. Each step of the cell cycle is monitored by internal controls called checkpoints.
2. There are three major checkpoints in the cell cycle: one near the end of G₁, a second at the G₂/M transition, and the third during metaphase.
3. Positive regulator molecules allow the cell cycle to advance to the next stage.
4. Negative regulator molecules monitor cellular conditions and can halt the cycle until specific requirements are met.