Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 57

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Question 1
1 / -0

Lightly stained region of chromatin during interphase is

A
Genetically inactive

B
Highly condensed region

C
Rich in loosely packed DNA

D
Rich in tightly packed DNA.

Solution

Answer is option C i.e. "Rich in loosely packed DNA"
Euchromatin is an uncoiled (loosely) packed form of chromatin (DNA or RNA)and are genetically active that is enriched in genes. Nucleus of non-dividing cells when observed under the light microscope, show two regions on the basis of concentration or intensity of staining. The dark stained areas are said as hetero-chromatin and light stained areas are said as euchromatin.
Question 2
1 / -0

Which one of the following statements about mitosis is correct?

A
One nucleus gives rise to $$4$$ nuclei.

B
Homologous chromosomes synapse during anaphase.

C
The centromeres separate at the onset of anaphase.

D
Non-sister chromatids recombine.

Solution

Mitosis is a process in which a single cell divides into two identical daughter cells. It is a equational division. The daughter cells contains same genetic material as of parent. It consists of 4 phases, namely prophase, metaphase, anaphase and telophase. During prophase, nuclear membrane disintegrate and asters move at two poles. During metaphse, they align themselves on the metaphase place. The centromeres separate at the onset of anaphase. In telophase, nuclear membrane appears around each set of chromosomes. Homologous chromosomes do not synapse during anaphase of mitosis. However, they synapase during prophase I of meiosis. Homologous chromosomes are independent in mitosis.
Thus, the correct answer is option C.
Question 3
1 / -0

No. of meiotic divisions required for the formation of $$200$$ seeds of Capsella will be?

A
$$200$$

B
$$400$$

C
$$250$$

D
$$300$$

Solution

This is a formula where x is considered as a number of seeds we want. So,number of meiotic divisions is equal to $$x+\dfrac{x}{4}$$.

So, $$200+\dfrac{200}{4}$$ is equal to $$250$$.

So, the correct answer is option C.
Question 4
1 / -0

In cell cycle, during interphase,

A
Two daughter cells are produced.

B
The nucleus is divided into two daughter nuclei.

C
The chromosome condenses.

D
The DNA is replicated.

Solution

The cell cycle is made up of two stages, interphase followed by mitosis. Mitosis is further divided into four phases, namely prophase, metaphase, anaphase and telophase followed by cytokinesis. Interphase is divided into G$$_1$$ phase, S phase, G$$_2$$ phase. At the end of the cell cycle during cytokinesis, two daughter cells are produced. At the end of mitosis during telophase, the nucleus is divided into two daughter nuclei and reaches two poles. At the start of mitosis during prophase, chromosome condenses. In interphase during S phase, the DNA is replicated.
Thus, the correct answer is option D.
Question 5
1 / -0

The formation of multivalent at meiosis in a diploid organism is due to.

A
Inversion

B
Deletion

C
Monosomy

D
Reciprocal translocation

Solution

Reciprocal translocation helps in the formation of multivalents in chromosome. It is a special type of chromosome abnormality caused by pieces of separate chromosomes breaking off their original chromosomes and switching places.
Thus D is the correct option.
Question 6
1 / -0

Synthesis phase in the cell cycle is called so, because of the synthesis of more

A
RNA

B
RNA and proteins

C
DNA

D
Glucose

Solution

The cell cycle is composed of interphase (G₁, S, and G₂ phases), followed by the mitotic phase (mitosis and cytokinesis) and G₀ phase. In S phase, the cell synthesizes a complete copy of the DNA in its nucleus.
DNA replication occurs without increasing the chromosome number, maintaining the same ploidy (number of chromosomal sets) as the parent cell.
So, the answer is C.
Question 7
1 / -0

In which of the following cells first meiotic division is observed.

A
Spermatogonia

B
Primary spermatocytes

C
Secondary spermatocytes

D
Spermatids

Solution

Primary spermatocytes are the male germ cells before meiosis I. During the process of spermatogenesis, primary spermatocyte undergoes the first meiotic division to produce two secondary spermatocytes. In this, no significant DNA synthesis takes place. After secondary meiosis, 4 spermatids are produced from two spermatocytes. These spermatids then mature without further cell division into sperm.
Thus, the correct answer is option B.
Question 8
1 / -0

Select the correct option with respect to mitosis.

A
Chromatids separate but remain in the centre of the cell in anaphase.

B
Chromatids start moving towards opposite poles in telophase.

C
Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase.

D
All of these.
Question 9
1 / -0

If the number of chromosomes in $$G_1$$ phase is 18. What will be the number of chromosomes in S-phase.

A
36

B
18

C
9

D
19

Solution

Given : Number of chromosomes in $$G_1$$ phase =18
To find : Number of chromosomes in S-phase

During $$G_1$$ phase, the cell is metabolically active and continuously grows but doesnot replicate is DNA. Therefore, the number of chromosomes in S-phase is 18 when the number of chromosomes in $$G1$$ phase was 18.
Thus B is the correct option.
Question 10
1 / -0

Meiosis can be observed in _________________.

A
$$\displaystyle Tapetal \ cells$$

B
$$\displaystyle Megaspores$$

C
$$\displaystyle Micropores$$

D
$$\displaystyle Spore \ mother \ cells$$

Solution

A megaspore mother cell is a diploid cell in plants in which meiosis will occur, resulting in the production of four megaspores. Generally, within each sporangium, meiosis of a megaspore mother cell produces four haploid megaspores. In gymnosperms and angiosperms, only one of these four megaspores are functional at maturity, and the other three soon degenerate.

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Cell Cycle and Cell Division Test - 57

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Cell Cycle and Cell Division Test - 57

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Question 1

Genetically inactive

Highly condensed region

Rich in loosely packed DNA

Rich in tightly packed DNA.

Solution

Question 2

One nucleus gives rise to $$4$$ nuclei.

Homologous chromosomes synapse during anaphase.

The centromeres separate at the onset of anaphase.

Non-sister chromatids recombine.

Solution

Question 3

$$200$$

$$400$$

$$250$$

$$300$$

Solution

Question 4

Two daughter cells are produced.

The nucleus is divided into two daughter nuclei.

The chromosome condenses.

The DNA is replicated.

Solution

Question 5

Inversion

Deletion

Monosomy

Reciprocal translocation

Solution

Question 6

RNA

RNA and proteins

DNA

Glucose

Solution

Question 7

Spermatogonia

Primary spermatocytes

Secondary spermatocytes

Spermatids

Solution

Question 8

Chromatids separate but remain in the centre of the cell in anaphase.

Chromatids start moving towards opposite poles in telophase.

Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase.

All of these.

Question 9

36

18

9

19

Solution

Question 10

$$\displaystyle Tapetal \ cells$$

$$\displaystyle Megaspores$$

$$\displaystyle Micropores$$

$$\displaystyle Spore \ mother \ cells$$

Solution

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