Home
Class 11
BIOLOGY
Assertion: Some cells enter G(0) phase l...

Assertion: Some cells enter `G_(0)` phase leading to inactivation of cell cycle.
Reason: `G_(0)` phase occurs due to non-availability of mitogen and energy rich compounds.

A

If both assertion and reason are true and reason is the correct explantion of assertion

B

If both assertion and reason are true but reason is not the correct explnantion of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
The phase in which cells fail to divide further (do not undergo S-phase after `G_(1)`-phase) is known as `G_(0)` phase or quiescent stage. It occurs due to non-availability of mitogen and energy rich compounds. The cells remain metabolically active, but no longer proliferate unless called on to do so depending on the requirement of the organisms.
Promotional Banner

Similar Questions

Explore conceptually related problems

Cell in G_0 Phase of cycle cell

Assertion: G_(1) phase is the interval between mitosis and initiation of DNA replication. Reason: The cell is metabolically inactive druing G_(1) phase.

Which phase comes in between the G_1 and G_2 phase of cell cycle?

Which of the following statements is correct regarding G_(0) phase?

The cells that do not divide further, exit G_(1) phase to enter an inactive stage called__ of the cell cycle.

During the G1 phase of cell division

Read the following statements about cell division and select the correct ones. (i) M phase represents the phase when actual cell division occurs and I phase represents the phase between two successive M phases. (ii) In the 24 hours average duration of cell cycle of a human cell, cell division proper lasts for only about an hour. (iii) M phase constitutes more than 95% of the duration of cell cycle.

Assertion : Nitrogenase enzyme gets inactivated in presence of oxygen yet N_(2) fixation occurs in aerobic cells of legume nodules. Reason : Leghaemoglobin allows presence of oxygen just sufficient for cellular respiration only.

Assertion: Prophase is the first stage of mitosis which follows S and G_(1) phases of interphase. Reason: Prophase is marked by the initiation of clusters of chromosomes.

The DNA content of individual cells and the number of cells in each phase of a cell cycle" can be determined using flow cytometry. Which of the following combinations of "phase of a cell cycle and its corresponding DNA content" can be considered normal? (i) Diploid cells found in the G_(0) or G_(1) phase. (ii) Cells with twice the normal DNA content in the early M phase. (iii) Cells with twice the normal DNA content in the G_(2) phase.