Test: Cell Cycle (NCERT) - NEET MCQ

# Test: Cell Cycle (NCERT) - NEET MCQ

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## 10 Questions MCQ Test Biology Class 11 - Test: Cell Cycle (NCERT)

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Test: Cell Cycle (NCERT) - Question 1

### 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.

Detailed Solution for Test: Cell Cycle (NCERT) - Question 1

Cell cycle consists of two basic phases, long non-dividing I phase and a short-dividing M phase. In the average duration of 24 hours in the cell cycle of a dividing human cell, M phase lasts for one hour (less than 5% of total ) while I phase or interphase occupies 75-95% of total generation time.

Test: Cell Cycle (NCERT) - Question 2

### Select the incorrect statement regarding S phase of interphase

Detailed Solution for Test: Cell Cycle (NCERT) - Question 2

S or synthesis phase marks the period during which DNA synthesis or replication takes place. DNA synthesis or replication takes place. During this time the amount of DNA per cell doubles, however, there is no increase in the chromosome number.

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Test: Cell Cycle (NCERT) - Question 3

### Human cells in culture show a cell cycle to be completed in approximately

Detailed Solution for Test: Cell Cycle (NCERT) - Question 3

(i) Cell division is the process by which a cell divides to form to nearly equal daughter cell which resembles the parent. The cell cycle is the sequence of events which occur during the cell growth and cell division. It is completed into two steps interphase and M-phase.
(ii) In the cell cycle interphase is the period between the end of one division to the beginning of next cell division. It is known as the resting phase. In the case of human beings it is around 24 hours then the M phase takes place.

Test: Cell Cycle (NCERT) - Question 4

In a somatic cell cycle, DNA synthesis takes place in which of the following phases?

Detailed Solution for Test: Cell Cycle (NCERT) - Question 4
• The cell cycle consists of several distinct phases, including interphase and mitosis. Interphase, which is the longest phase of the cell cycle, can be further divided into three subphases: G1 (gap phase 1), S (synthesis phase), and G2 (gap phase 2).
• During the S phase, DNA synthesis occurs. This is the period when the cell replicates its DNA to ensure that each daughter cell produced during cell division receives a complete set of genetic information.
• The DNA replication process involves unwinding and separating the two strands of the DNA double helix and synthesising new complementary strands using the existing strands as templates. As a result, each chromosome is duplicated, and sister chromatids are formed, which remain attached at the centromere.
• After the S phase, the cell progresses into the G2 phase, where it prepares for cell division. The subsequent phase is mitosis, which includes prophase, prometaphase, metaphase, anaphase, and telophase, leading to the separation of sister chromatids and the formation of two identical daughter cells.
• Therefore, DNA synthesis occurs specifically during the S phase of the somatic cell cycle.
Test: Cell Cycle (NCERT) - Question 5

The correct sequence of phases of cell cycle is?

Detailed Solution for Test: Cell Cycle (NCERT) - Question 5

The cell cycle starts from interphase. Interphase is the phase in the cell cycle that prepares a cell nucleus for division. It has three stages — G1, S and G2 G1, Phase is the longest stage of interphase, also first growth phase or post-mitotic gap phase. Both and its nucleus grow in size. There is synthesis proteins, nucleotides, amino acids for histones an rich compounds. In S-Phase chromosomes along with their DNAs replicate. DNA content doubles during this phase. In G2-Phase there is increased synthesis of RNA and proteins. Cell organelles or their precursorsmultiply. Cell grows in Size.

Test: Cell Cycle (NCERT) - Question 6

A cell cycle starts from ___.

Detailed Solution for Test: Cell Cycle (NCERT) - Question 6

The cell cycle starts from interphase. Interphase is the phase in the cell cycle that prepare a cell and its nucleus for division. It has three stages- G1​,S and G2​. M- phase is the final phase of cell cycle..It represent the phase of actual division.

Test: Cell Cycle (NCERT) - Question 7

Which of the following phases of the cell cycle is not a part of interphase?

Detailed Solution for Test: Cell Cycle (NCERT) - Question 7

Interphase in a cell cycle has three stages —G1,S and G2.M− phase is not a part of interphase.

Test: Cell Cycle (NCERT) - Question 8

The cells that do not divide further, exit G1 phase to enter an inactive stage called_____of the cell cycle.

Detailed Solution for Test: Cell Cycle (NCERT) - Question 8

The phase in which cells fail to divide further (do not enter S- phase after G1 -phase) and undergo differentiation is known as G0 phase or quiescent stage. It occurs due to non availability of mitogen and energy rich compounds. The cells remain metabolically active, grow in size and differentiate for particular function after attaining a particular shape.

Test: Cell Cycle (NCERT) - Question 9

Synthesis of histone proteins occurs in

Detailed Solution for Test: Cell Cycle (NCERT) - Question 9

Replication of DNA along with the synthesis of nuclear proteins such as the histones occur during S phase of interphase.

Test: Cell Cycle (NCERT) - Question 10

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 G0 or G1 phase.
(ii) Cells with twice the normal DNA content in the early M phase.
(iii) Cells with intermediate amounts of DNA in the S phase.
(iv) Cells with twice the normal DNA content in the G2 phase.

Detailed Solution for Test: Cell Cycle (NCERT) - Question 10

The diploid cells found in the G0 and G1 phase before starting the G2 or M phase but before anaphase. Cells with twice the normal DNA is in G2 or M phase that is mitosis phase. The S phase is characterized by intermediate DNA when the DNA starts replicating itself, till the entire replication process is complete.

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