Which statement is true about the cell cycle?
Choices:
a. The cell cycle is controlled solely by internal signals.
b. The cell cycle is controlled solely by signals external to the cell.
c. The timing of cell division is combined by the cyclins and CDKs.
d. Uncontrolled growth happens in the cell cycle.
Answers
Answer:
D Is The Right Answer
hope it Helps ; )
Answer:
The correct option for this question is option C) The timing of the cell division is usually combined by the cyclins and CDKs.
Explanation:
The cell cycle is a very crucial process in the living organism for the growth and repair of the existing cells by the generation of the newly formed cells. It comprises the various process that is involved in the cell cycle.
Interphase
G1 phase
S phase
G2 phase
The cell cycle in mitosis usually comprises of the following phases:
- Prophase
- Metaphase
- Anaphase
- Telophase
Whereas in the case of meiosis it is completed with the help of two M phases, one is Meiosis 1, and the other which mimics the mitosis that is Meiosis 2.
- Prophase 1
- Metaphase 1
- Anaphase 1
- Telophase 1
- Prophase 2
- Metaphase 2
- Anaphase 2
- Telophase 2
Option C is correct as in the stages of the cell cycle, various cyclins and the CDKs are involved which are present at the checkpoints and help in further signalling and proliferation of the cell cycle. The making of the cyclin or the CDKs controls the cell-cycle proliferation via the phosphorylation of the targeted genes. The activation of the major cyclins/CDKs is majorly induced by the mitogenic signals and are also inhibited by the activation of cell-cycle checkpoints usually generated in response to DNA damage to stop the cell cycle.