Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 89

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Weekly Quiz Competition

Question 1
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Which one is CORRECT about s-phase (synthetic phase)?
I. It occurs between $$G_1$$ and $$G_2$$
II. It marks the period during which DNA replicates
III. At the end of this phase DNA is doubled but the number of chromosomes remains unchanged
IV As the DNA is doubled in this phase number of chromosomes is also doubled
V. Centrioles replicate in this phase

A
$$I,II,IV,V $$ are correct

B
$$I,II,III,V $$ are correct

C
All are correct

D
Only IV is correct

Solution

Statement IV is incorrect while rest are correct. Only DNA is doubled during S phase. Chromosome duplication takes place during 'M' phase of cell cycle.
So, the correct option is 'I, II, III, V are correct'.
Question 2
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Select the events that do not occur in interphase stage of cell-cycle.
A. RNA and protein synthesis.
B. Cytoplasmic growth.
C. Polymerisation of spindle fibres protein.
D. Disappearance of Golgi bodies and ER.
E. DNA molecules in highly super coiled stage.

A
C, D & E

B
D & E only

C
B, C & D

D
C & D only

Solution

The three stages of interphase are G1, which stands for Gap phase 1; S phase, which stands for Synthesis phase; and G2, which stands for Gap phase 2. Interphase is the first of two phases of the eukaryotic cell cycle. The second phase is mitosis, or M phase, which is when cell division occurs.
During interphase, the DNA amount becomes double. Due to accumulation of ribosomal RNA (rRNA) and ribosomal proteins in the nucleolus, the size of the latter is greatly increased. DNA is in highly condensed stage.
Disappearance of golgi bodies and endoplasmic reticulum as well as polymerisation of spindle fibre take place during M phase.
So, the correct option is 'C & D only'.
Question 3
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The structures that line up the chromosomes on the equatorial plate during metaphase are called?

A
Asters

B
Polar and kinetochore microtubules

C
Centrosomes

D
Centrioles
Solution
A.Correct option -B
B.Explanation for correct option -

In metaphase, the centromere of the chromosomes aligns themselves on the metaphase plate ( equatorial plate), an imaginary line that is equidistant from the two centrosomes plate.
This even alignment is due to the counterbalance of the pulling powers, generating by opposing kinetochore microtubules.
Question 4
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Which statement is not correct with respect to the diagram given below?

A
There are two chromatids in each chromosome at this stage

B
It may represent anaphase-II

C
Some chromatids have already undergone crossing over

D
All of the above.

Solution
Question 5
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All are essential stages that take places during meiosis, except

A
82 successive divisions without any DNA replication to occurring between them

B
Formation of chiasmata & Crossing over

C
Segregation of homologous chromosomes

D
No. of chromosomes in daughter cells after meiosis

Solution

Meiosis:- This process takes place only in the production of gametes in humans. It is a division process.

It occurs in eukaryotic organisms. In this process, one cell divides into four daughter cells. It consists of total $$9$$ stages. Each cell has half the number of chromosomes.

(A) $$82$$ successive divisions without any DNA replication to occuring between them.
Question 6
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Which stage of cell division provided visual evidence of mendel's law of independent assortement?

A
Mitotic anaphase

B
Meiotic anaphase-I

C
Mitotic Metaphase

D
Meiotic anaphase-II
Question 7
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A cell has 10 pairs of chromosomes. After mitotic division, the number of chromosomes in the daughter cells will be:

A
Five

B
Ten

C
Twenty

D
Fourty
Question 8
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The drawing given shows a cell whose diploid chromosome number is four. This cell is in?

A
Metaphase of mitosis

B
Anaphase of mitosis

C
First anaphase of meiosis

D
Second anaphase of meiosis

Solution

Anaphase I begins when the two chromosomes of each bivalent (tetrad) separate and start moving toward opposite poles of the cell as a result of the action of the spindle. It has to be noted that in anaphase I the sister chromatids remain attached at their centromeres and move together toward the poles. So the correct option is 'first anaphase of meiosis'.
Hence the correct answer is (C)
Question 9
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In the somatic cell cycle.

A
DNA replication takes place in S-phase

B
A short interphase is followed by a long mitotic phase

C
$$G_2$$ phase follows mitotic phase

D
In $$G_1$$ phase DNA content is double the amount of DNA present in the original cell

Solution

A somatic cell is a general term for a body cell: all human cells, except for the cells that produce eggs and sperm (germ cells), are somatic cells. The cell cycle has two major phases: interphase and the mitotic phase. During the s phase of interphase the DNA is replicated.
So, the correct option is option A.
Question 10
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Interphase is divided into ..

A
$$G_1,S,G_2$$

B
Mitosis

C
Prophase metaphase, Anaphase ,Telophase

D
Cytokinesis

Solution

Interphase is the preparatory phase of the cell and is divided into $$G_1$$, S and $$G_2$$. The $$G_1$$ phase includes increase in the cytoplasmic content of the cell, replication of cell organelles, formation of various proteins etc,
The S phase is marked by the replication of DNA and synthesis of Histone proteins.
The G$$_2$$ phase includes other protein synthesis and duplication of the centrioles (if it is an animal cell).
So, the correct answer is '$$G_1$$, S, $$G_2$$'

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Cell Cycle and Cell Division Test - 89

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Cell Cycle and Cell Division Test - 89

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Question 1

$$I,II,IV,V $$ are correct

$$I,II,III,V $$ are correct

All are correct

Only IV is correct

Solution

Question 2

C, D & E

D & E only

B, C & D

C & D only

Solution

Question 3

Asters

Polar and kinetochore microtubules

Centrosomes

Centrioles

Solution

Question 4

There are two chromatids in each chromosome at this stage

It may represent anaphase-II

Some chromatids have already undergone crossing over

All of the above.

Solution

Question 5

82 successive divisions without any DNA replication to occurring between them

Formation of chiasmata & Crossing over

Segregation of homologous chromosomes

No. of chromosomes in daughter cells after meiosis

Solution

Question 6

Mitotic anaphase

Meiotic anaphase-I

Mitotic Metaphase

Meiotic anaphase-II

Question 7

Five

Ten

Twenty

Fourty

Question 8

Metaphase of mitosis

Anaphase of mitosis

First anaphase of meiosis

Second anaphase of meiosis

Solution

Question 9

DNA replication takes place in S-phase

A short interphase is followed by a long mitotic phase

$$G_2$$ phase follows mitotic phase

In $$G_1$$ phase DNA content is double the amount of DNA present in the original cell

Solution

Question 10

$$G_1,S,G_2$$

Mitosis

Prophase metaphase, Anaphase ,Telophase

Cytokinesis

Solution

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