Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 61

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Question 1
1 / -0

Cell would normally proceed to mitosis without interruption

A
Once it has entered the S phase

B
Once it has entered the $$G_2$$ phase

C
At any time during cell division activity

D
None of these

Solution

The availability of mitogen and energy rich compounds decide whether $$G_1$$ phase will be arrested ($$G_0$$ phase) or undergo S- phase. This point is called check point or $$G_1$$ cyclin or $$G_1$$ point. Once the checkpoint of $$G_1$$- phase is crossed and cell has entered S - phase, cell cycle will go on further division till completion.
So, the correct answer is 'Once it has entered the S phase'.
Question 2
1 / -0

Select the correct option:
The cells that do not divide further, exit $$G_1$$ phase to enter an inactive stage called ______ of the cell cycle.

A
M stage

B
$$G_2$$ stage

C
S stage

D
$$G_0$$ stage

Solution

The phase in which cell fail to divide further (do not enter S- phase after $$G_1$$ - phase) and undergo differentiation is known as $$G_0$$ phase or quiescent stage. It occurs due to non- availability of mitogen and energy rich compounds. The cells remains metabolically active, grow in size and differentiate for particular function after attaining a particular shape.
Question 3
1 / -0

Select the correct option:
Which of the following statements is correct?

A
Animals can show mitotic divisions in both haploid and diploid cells.

B
After S phase the number of chromosomes becomes double i.e. 2n to 4n.

C
During the $$G_2$$ phase, proteins are synthesised in preparation for mitosis while cell growth continues.

D
S or synthesis phase marks the period during which RNA synthesis takes place.

Solution

The interface is an important step in the cell cycle and is a period between the end of one cell division to the beginning of next cell division. It is the resting phase but it is actually the most metabolically active phase in which the cell prepares itself for the next cell division. It has G₂ stage the chromosome condensation factor appears the synthesis of three types of RNA and protein and ATP molecule occurs, mitotic spindle protein tubulin synthesis begins and the damage DNA repair occurs.

So the correct statement is 'During the G₂ phase, proteins are synthesised in preparation for mitosis while cell growth continues.
Question 4
1 / -0

Select the correct option: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 intermediate amounts of DNA in the S phase.
(iv) Cells with twice the normal DNA content in the $$G_2$$ phase.

A
(i) and (ii)

B
(ii) and (iii)

C
(iii) and (iv)

D
(i), (ii), (iii) and (iv)

Solution

The sequence of events which occur during cell growth and cell division are collectively known as the cell cycle. The cell cycle is completed into two steps; the interphase which is again divided into G₁ and G₂ phase and the M phase which is the mitotic phase in which karyokinesis and cytokinesis take place.
In G₁ phase of interphase synthesis of the content of the cell is there growth and cell take place. During the S phase, the DNA replication takes place and its amount becomes double. During the G₂ phase, the chromosome condensation factor appears and DNA repair occurs.

So, the correct option is '(i), (ii), (iii) and (iv)'
Question 5
1 / -0

This phase of cell cycle is a period of intense synthesis and growth. It constitutes 95% of the duration of the cell cycle. It is

A
Interphase

B
Telophase

C
Prophase

D
Anaphase

Solution

One cycle of cell division in human cells takes 24 hours in which cell division proper lasts for only about an hour while interphase lasts more than $$95\%$$ of the duration of cell cycle.
Question 6
1 / -0

Select the correct option:
Which of the following phases of the cell cycle is not a part of interphase?

A
S

B
$$G_1$$

C
$$G_0$$

D
M

Solution

Interphase in a cell cycle has three stages -$$G_1,S$$ and $$G_2$$. M-phase is not a part of interphase.
Question 7
1 / -0

In which stage DNA replication takes place?

A
Metaphase

B
$$G_1$$ -phase

C
$$S $$- phase

D
$$G_2$$ -phase

Solution

The $$G_1$$ phase is the gap between M phase and S phase and is marked by synthesis of RNA and protein (excluding histones) and duplication of all cell content except DNA.
S phase of DNA replication is followed by $$G_2$$ phase during which cell double-checks the duplicated DNA content.
The M phase of cell cycle is marked by the division of the nucleus and cytokinesis to produce daughter cells. $$G_0$$ phase is the quiescent stage.
So, the correct answer is S - phase.
Question 8
1 / -0

Select the correct option:
During anaphasic movements of chromosomes, ______ of each chromosome is/are towards the pole and _____ of the chromosome trail(s) behind.

A
Centromere, arms

B
Arms, centromere

C
Chromatids, centromere

D
None of these

Solution

In the anaphasic movement of chromosomes, the centromeres lead the path while the arms trail behind. As a result, the anaphasic chromosomes appear V-, L-,J- and I shaped. The shapes are formed respectively in metacentric, submetacentric, acrocentric and telocentric chromosomes.
So, the correct answer is 'Centromere, arms'.
Question 9
1 / -0

Select the correct option:
_______ is the best stage to count the number and study the morphology of chromosomes.

A
Prophase

B
Metaphase

C
Anaphase

D
Telophase

Solution

Metaphase is the best phase to count total number of chromosomes in any species and detailed study of the morphology of chromosome. Idiogram (arrangement of chromosomes in a series of decreasing length ) can be drawn in This stage.
So, the correct answer is 'Metaphase'.
Question 10
1 / -0

In which of the following stages, a chromosome is minimum coiled?

A
Prophase

B
Metaphase

C
Anaphase

D
Interphase

Solution

A cell spends most of its time in interphase. It is the time before mitosis and is further divided into three phases, G1, S, and G2. During G1, cellular organelles, cytoplasm, biomolecules, and proteins duplicate. In S phase, DNA gets replicated. In G2 phase, it is made sure that no errors are present.
Chromosomes are seen less coiled in interphase compared to any other stages of mitosis. So the correct answer is interphase.
So the correct option is "interphase".

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Cell Cycle and Cell Division Test - 61

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Cell Cycle and Cell Division Test - 61

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Question 1

Once it has entered the S phase

Once it has entered the $$G_2$$ phase

At any time during cell division activity

None of these

Solution

Question 2

M stage

$$G_2$$ stage

S stage

$$G_0$$ stage

Solution

Question 3

Animals can show mitotic divisions in both haploid and diploid cells.

After S phase the number of chromosomes becomes double i.e. 2n to 4n.

During the $$G_2$$ phase, proteins are synthesised in preparation for mitosis while cell growth continues.

S or synthesis phase marks the period during which RNA synthesis takes place.

Solution

Question 4

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i), (ii), (iii) and (iv)

Solution

Question 5

Interphase

Telophase

Prophase

Anaphase

Solution

Question 6

S

$$G_1$$

$$G_0$$

M

Solution

Question 7

Metaphase

$$G_1$$ -phase

$$S $$- phase

$$G_2$$ -phase

Solution

Question 8

Centromere, arms

Arms, centromere

Chromatids, centromere

None of these

Solution

Question 9

Prophase

Metaphase

Anaphase

Telophase

Solution

Question 10

Prophase

Metaphase

Anaphase

Interphase

Solution

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