Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 87

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Weekly Quiz Competition

Question 1
1 / -0

Identify the stage of mitosis with its characteristics

A
Metaphase - chromosomes moved to spindle equator, chromosomes made up of two chromatids

B
Anaphase - Centromeres split, chromatids separate and start moving away

C
Late Prophase - chromosomes move to spindle equator

D
Metaphase - Spindle fibers attached to kinetochores, centromeres split and chromatids separate.

Solution

The given stage of mitosis, shows, chromosomes lie over the equator of the spindle and organised into the Metaphasic plate. This stage is identified as Metaphase.
So, the correct answer is Metaphase, chromosomes moved to spindle equator, chromosomes made up of two chromatids.
Question 2
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What are spindle fibers that connect the centromere to respective poles called?

A
Astral rays

B
Interphase fibers

C
Chromosomal fibers

D
Interchromosomal fibers
Question 3
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How many mitotic divisions must occur in a cell to form $$512$$ cells?

A
$$128$$

B
$$511$$

C
$$512$$

D
$$10$$
Solution
The plant cell divides mitotically to form two cells. For the formation of 512 cells, the plant cell needs to divide 2$$^n$$ times.
When the parent cell will divide for the first time to produce 2 cells, this is the first division. Later on, the two cells will divide 2$$^9$$ times for the production of 512 cells.
So, the total number of mitotic divisions by one cell to form 512 cells will be 10 divisions.
Question 4
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A diploid cell in human, where cell division does not occur:
(a) Heart cell
(b) Muscle cell
(c) Nerve cell

A
Only c

B
b and c

C
a and c

D
a, b and c

Solution

The diploid cell of the human body which includes heart cell, muscle cell, and nerve cell out of which only muscle cell has the ability to regenerate after any muscle damage as they get stimulated to divide and repair the damaged fibers. While on the other hand heart cell loses their ability to divide after birth. The nerve cell cannot divide due to lack of centrioles hence it cannot perform mitosis.
So, the correct option is 'a,b and c'
Question 5
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If egg of an organism has $$10pg$$ of DNA in its nucleus. How much DNA would a diploid cell of same organism have in $${G}_{2}$$ phase of meiosis?

A
$$10pg$$

B
$$5pg$$

C
$$2pg$$

D
$$40pg$$

Solution

The egg of an organism is haploid, hence in the given question, 10pg refers to the haploid content of DNA. It means the DNA content of a diploid cell of the same organism would be 20pg. Now, when this diploid cell undergoes meiosis, during the S-phase of its interphase, its DNA content doubles to become 40pg. In the G2 phase which follows the S-phase, we can find its DNA content to be 40pg.
So, the correct answer is '40pg'.
Question 6
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Choose the incorrect match w.r.t mitosis.

A
Metaphase - Study of morphology of chromosome

B
Anaphase - Poleward movement of chromatids

C
Prophase - Shortest phase

D
Telophase - Final stage of mitotic karyokinesis

Solution

Mitosis includes five phases of cell division. It usually occurs in a somatic cell and lower organisms where the ploidy needs to be maintained. Each phase has its characteristic property.
Interphase is the longest phase, also called resting phase in which cell prepares itself to undergo cell division by doubling its material.
Prophase is the shortest phase where condensation of the chromosomes occurs.
Metaphase is the best phase to study the structures of the chromosomes and chromosomes align themselves at the equatorial plate.
Anaphase is the poleward movement of chromatids when the centromere splits. It is the best phase to study the morphology of the chromosome.
Telophase is the final stage of cell division when all the material divides equally into two halves.
So, the correct division is 'Metaphase - Study of the morphology of chromosome'.
Question 7
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In a butterfly has chromosomes number $$360$$ in its meiocyte $$(2n)$$. What will be the chromosome number in its gametes?

A
$$380$$

B
$$180$$

C
$$95$$

D
$$760$$

Solution

In the case of butterfly:
Chromosome numbers in meiocytes (diploid, 2n)= 360
Gametes (haploid, n)= 180

So, the correct answer is option B.
Question 8
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Starting with microspore mother cells, what is the least number of meiotic and mitotic divisions needed for the formation of $$500$$ male gametes in an angiosperm?

A
$$65$$ and $$500$$

B
$$63$$ and $$252$$

C
$$63$$ and $$500$$

D
$$63$$ and $$504$$
Solution
- In angiosperms, one microspore mother cell undergoes meiosis to form four microspores or pollen grains.
- Each pollen grain by undergoing two mitotic divisions produces two male gametes. 63 microspore mother cells undergo 63 meiotic divisions and form into 252 microspores or pollen grains.
- These 252 microspores undergo 504 mitotic divisions and form into 504 male gametes.
So, the correct option is ’63 and 500’.
Question 9
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Chromosomes arrange at equatorial plate of division spindle in

A
Prophase

B
Metaphase

C
Anaphase

D
Telophase

Solution

Prophase is the first phase of mitosis, that separates the duplicates genetic material carried in the nucleus of the parent cell into two identical daughter cells.
In metaphase, the spindle fibres are formed and get attached to the centromere of each chromosome.
In Anaphase the chromosomes move towards the opposite poles due to contraction of spindle fibre.
In telophase, daughter nuclei are formed/
So, the correct option is 'Metaphase'.
Question 10
1 / -0

Post mitotic gap phase and synthetic phases of cell cycle are also respectively referred to as:

A
$$G_2$$ and $$S$$

B
$$G_1$$ and $$S$$

C
$$G_1$$ and $$G_2$$

D
$$S$$ and $$G_2$$

Solution

Cell cycle show two phases, namely interphase and M phase. Interphase is the resting phase of the cell cycle, in which cell does not undergo cell division. It shows three subphases G1, S and G2. it is followed by mitotis phase(M phase). M phase is immediatly followed by Interphase again.
So, the post mitotic phase of the cell cycle is G1, which is followed by S.
So, the correct option is 'G1 and S'.

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Cell Cycle and Cell Division Test - 87

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Cell Cycle and Cell Division Test - 87

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Question 1

Metaphase - chromosomes moved to spindle equator, chromosomes made up of two chromatids

Anaphase - Centromeres split, chromatids separate and start moving away

Late Prophase - chromosomes move to spindle equator

Metaphase - Spindle fibers attached to kinetochores, centromeres split and chromatids separate.

Solution

Question 2

Astral rays

Interphase fibers

Chromosomal fibers

Interchromosomal fibers

Question 3

$$128$$

$$511$$

$$512$$

$$10$$

Solution

Question 4

Only c

b and c

a and c

a, b and c

Solution

Question 5

$$10pg$$

$$5pg$$

$$2pg$$

$$40pg$$

Solution

Question 6

Metaphase - Study of morphology of chromosome

Anaphase - Poleward movement of chromatids

Prophase - Shortest phase

Telophase - Final stage of mitotic karyokinesis

Solution

Question 7

$$380$$

$$180$$

$$95$$

$$760$$

Solution

Question 8

$$65$$ and $$500$$

$$63$$ and $$252$$

$$63$$ and $$500$$

$$63$$ and $$504$$

Solution

Question 9

Prophase

Metaphase

Anaphase

Telophase

Solution

Question 10

$$G_2$$ and $$S$$

$$G_1$$ and $$S$$

$$G_1$$ and $$G_2$$

$$S$$ and $$G_2$$

Solution

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