Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

During which stage of the cell cycle is cell growth and replication of organelles most significant?

A
M phase

B
$$G_1$$ phase

C
$$G_2$$ phase

D
S phase

Solution

Interphase consists of G1, G2, and S phase. G1 stage is the state where the cell grows and replicates most of its organelles wheres in S stage the cell duplicates its DNA and in G2 some organelle replication takes place along with some growth.
So the correct answer is the 'G1 phase'.
Question 2
1 / -0

The critical checkpoints that control the cell cycle are at the

A
$$G_1$$ to S stage and $$G_2$$ to M stage

B
S to $$G_2$$ stage and $$G_2$$ to M stage

C
M to $$G_1$$ stage and $$G_2$$ to M stage

D
M to $$G_1$$ stage and S to $$G_2$$ stage

Solution

The cell cycle is mainly under the control of two checkpoints. One during the transition from G1 to S Stage. As cell further processes into the cell cycle it faces another checkpoint when it transits between G2 to M stage.
So the correct answer is 'G1 to S stage and G2 to M stage'.
Question 3
1 / -0

If an haploid cell of an animal cell contain 'C' concentration of DNA than what is the amount of DNA in $$G_{2}$$ phase of Diploid cell

A
4C

B
2C

C
C

D
8C

Solution

By late G2 phase the cell (diploid 2C) has already copied it's DNA because during S phase ( occurs before G2 ) the diploid cell doubles the total DNA by replication and hence the DNA is twice the total amount in diploid cell. Hence , if a haploid cell of same organism contains DNA equivalent to C , then the diploid cell in G2 phase will contain DNA equivalent to 4C.
So, the correct option is '4C'
Question 4
1 / -0

In onion root tip during metaphase stage of mitiosis the number of kinetochores will be -

A
4

B
8

C
16

D
32

Solution

The state of the cell in metaphase stage of mitosis in root tip is diploid that is 2n, so there is 16 chromosome in root tip of onion as n is 8. But each chromosome contains 2 kinetochores, so the number of kinetochores in metaphase stage of mitosis is 32.
So, the correct option is D.
Question 5
1 / -0

If a cell have 20 chromosome and 2C DNA content in $$G_1$$ phase. So how many chromosome number and DNA content is found in $$G_2$$ phase :-

A
40 and 4C

B
20 and 2C

C
20 and 4C

D
40 and 2C
Question 6
1 / -0

A somatic cell that has just completed the S-phase of the cell cycle, as compared to gamete of the same species has

A
twice the number of chromosomes and twice the amount of DNA

B
same number of chromosomes and four times the amount of DNA

C
twice the number of chromosomes and four times the amount of DNA

D
four times the number of chromosomes and twice the amount of DNA.
Solution
Correct Option: C
Explanation:
When compared to gametes of the same species, the amount of DNA and chromosome number of a somatic cell that had just completed the S-phase of its cell cycle contains 4 times more DNA and double the number of chromosomal.
A gamete is a haploid in general.
A diploid cell is a somatic cell.
Hence, a somatic cell that has just completed the S-phase of the cell cycle, as compared to gamete of the same species has twice the number of chromosomes and four times the amount of DNA.
Question 7
1 / -0

How many chromosomes will the cell have at $$G_1$$ after S and after M phase respectively, if it has 14 chromosomes at the beginning of interphase?

A
7, 14, 14

B
14, 14, 14

C
14, 14, 7

D
7, 7, 7
Solution
Correct Option: B
Explanation:
- The order of cell cycle phase is $$ {{G}_{1}}\to S\to M$$
- In $${{G}_{1}}$$phase, the cell synthesizes takes place and In $$S$$ phase DNA duplication occurs.
- initially 14 chromosomes were present in $${{G}_{1}}$$phase .
- In $$S$$ phase, no change in chromosome number. So, again 14 chromosomes present.
- At beginning of M phase, again there is no change.
Hence, the cell will have the chromosome number at $${{G}_{1}}$$, after $$S$$, and after $$M$$ phase respectively are
$$14,14,14$$
Question 8
1 / -0

Select the incorrect statement regarding the S phase of interphase.

A
It occurs between $$G_1$$ and $$G_2$$ phase.

B
DNA replicates in the nucleus in this phase.

C
Centrioles duplicate in the cytoplasm.

D
As DNA is doubled, number of chromosomes also doubles.
Solution
- $$S$$ phase of interphase occurs between $$G_1 $$and $$G_2$$ phase.
- During this phase, the amount of DNA per cell doubles but the number of chromosomes remains the same i.e., if the cell had a diploid or 2n number of chromosomes in $$G_1$$, even after the $$S$$ phase, the number of chromosomes remains the same i.e 2n.
- Hence, as DNA is doubled, the number of chromosomes also doubles is an incorrect statement regarding the $$S$$ phase of interphase.
So, the correct answer is 'Option D'.
Question 9
1 / -0

Select the correct option:
Which phase occupies the maximum part of cell cycle?

A
Mitotic phase

B
Meiotic phase

C
Interphase

D
Cytokinesis

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.
So, the correct answer is 'Interphase'.
Question 10
1 / -0

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

A
42 hours

B
24 hours

C
24 minutes

D
24 seconds

Solution

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.
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.

So, the correct option is '24 hours'

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Cell Cycle and Cell Division Test - 60

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Cell Cycle and Cell Division Test - 60

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Question 1

M phase

$$G_1$$ phase

$$G_2$$ phase

S phase

Solution

Question 2

$$G_1$$ to S stage and $$G_2$$ to M stage

S to $$G_2$$ stage and $$G_2$$ to M stage

M to $$G_1$$ stage and $$G_2$$ to M stage

M to $$G_1$$ stage and S to $$G_2$$ stage

Solution

Question 3

4C

2C

C

8C

Solution

Question 4

4

8

16

32

Solution

Question 5

40 and 4C

20 and 2C

20 and 4C

40 and 2C

Question 6

twice the number of chromosomes and twice the amount of DNA

same number of chromosomes and four times the amount of DNA

twice the number of chromosomes and four times the amount of DNA

four times the number of chromosomes and twice the amount of DNA.

Solution

Question 7

7, 14, 14

14, 14, 14

14, 14, 7

7, 7, 7

Solution

Question 8

It occurs between $$G_1$$ and $$G_2$$ phase.

DNA replicates in the nucleus in this phase.

Centrioles duplicate in the cytoplasm.

As DNA is doubled, number of chromosomes also doubles.

Solution

Question 9

Mitotic phase

Meiotic phase

Interphase

Cytokinesis

Solution

Question 10

42 hours

24 hours

24 minutes

24 seconds

Solution

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