Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Centromere is required for which of the following?

A
Movement of chromosomes towards poles

B
Cytoplasmic cleavage

C
Crossing over

D
Transcription process

Solution

The centromere is the part of the chromosomes where the two sister chromatids are attached. It is required for movement of chromosomes towards poles. During mitosis, spindle fibers attach to the centromere via the kinetochore. Their physical role is to act as the site of assembly of the kinetochore - a highly complex multiprotein structure that is responsible for the actual events of chromosome segregation i.e., binding microtubules and signalling to the cell cycle machinery when all chromosomes have adopted correct attachments to the spindle, so that it is safe for cell division to proceed to completion and for cells to enter anaphase.
So, the correct answer is option A.
Question 2
1 / -0

Complete the following statement.
During meiosis, there is

A
One round of DNA replication and one division

B
Two round of DNA replication and one division

C
Two round of DNA replication and two division

D
One round of DNA replication and two division

Solution

Meiosis results in four haploid daughter cells by undergoing one round of DNA replication followed by two divisions, homologous chromosomes are separated in the first division and sister chromatids are separated in the second division. Meiosis I is a reductional division whereas the meiosis II is an equational division.
So, the correct answer is option D.
Question 3
1 / -0

The synthesis of proteins for formation of spindle fibres takes place in

A
G$$_1$$ phase

B
S phase

C
G$$_2$$ phase

D
M phase

Solution

The synthesis of proteins for formation of spindle fibers takes place in G$$_2$$ phase. G$$_2$$ phase, or pre-mitotic phase is the third and final subphase of Interphase in the cell cycle directly preceding mitosis. It follows the successful completion of S phase, during which the cells DNA is replicated. G$$_2$$ phase ends with the onset of prophase, the first phase of mitosis in which the cells chromatin condenses into chromosomes. G$$_2$$ phase is a period of rapid cell growth and protein synthesis during which the cell readies itself for mitosis.
So, the correct answer is option C.
Question 4
1 / -0

The number of DNA in chromosome at G$$_2$$ state of cell cycle is

A
One

B
Two

C
Four

D
Eight

Solution

The number of DNA in the chromosome at G$$_2$$ state of cell cycle is 2. G$$_2$$ phase, or pre-mitotic phase, which occurs just after the S phase where the DNA is duplicated. G$$_2$$ phase ends with the onset of prophase, the first phase of mitosis in which the cells chromatin condenses into chromosomes.
So, the correct answer is option B.
Question 5
1 / -0

The decision of cell division occurs at ___________.

A
Starting of G$$_1$$

B
End of G$$_1$$

C
Initial stage of prophase

D
End of telophase
Solution
- The decision of cell division occurs end of G$$_1$$. The G$$_1$$ phase, or growth 1/gap 1 phase, is the first of four phases of the cell cycle that takes place in eukaryotic cell division.
- In this part of interphase, the cell grows in size and synthesizes mRNA and proteins in preparation for subsequent steps leading to mitosis. G$$_1$$ phase ends when the cell moves into the S phase of interphase.
So, the correct answer is option B.
Question 6
1 / -0

The significance of meiosis is that it

A
Produce four cells having chromosomal number equal to mother cell.

B
Occurs in all types of cells.

C
Maintains the constant chromosomes number of a particular species.

D
Growth of animal body organs.

Solution

Meiosis is a specialized type of cell division which reduces the chromosome number by half. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells with half the number of chromosomes as the original parent cell. The two meiotic divisions are known as meiosis I and meiosis II. Because the number of chromosomes is halved during meiosis, this allows gametes to fuse to form a zygote containing a mixture of paternal and maternal chromosomes. Thus, meiosis and fertilization facilitate sexual reproduction with successive generations maintaining the same number of chromosomes.
Question 7
1 / -0

At what stage of the cell cycle, are histone proteins synthesized in a eukaryotic cell?

A
During telophase

B
During S phase

C
During G$$_2$$ stage of prophase

D
During entire prophase

Solution

During S phase of the cell cycle, the histone proteins are synthesized in a eukaryotic cell. The major event in S phase is DNA replication. The goal of this process is to create exactly two identical semi-conserved chromosomes. The cell prevents more than one replication from occurring by loading pre-replication complexes onto the DNA at replication origins during G$$_1$$ phase which is dismantled in S phase as replication begins.
So, the correct answer is option B.
Question 8
1 / -0

........... is the best material for the study of mitosis in laboratory.

A
Anther

B
Root tip

C
Leaf tip

D
Ovary

Solution

Cell division occurs rapidly in growing root tips of sprouting seeds or bulbs. The root and shoot tips have constantly dividing meristematic cell. So the root tips are the most commonly used for studying mitosis.
So, the correct answer is option B.
Question 9
1 / -0

The gametes are produced in gonads by the process of

A
Mitosis

B
Meiosis

C
Both A and B

D
None of the above

Solution

Gametes are the haploid sperm and egg cells, which must combine during fertilization. The production of gamete is the first step of sexual reproduction. An important part of gamete production is meiosis. This is the process, which forms haploid cells from diploid cells. This is also known as reductional division.
So, the correct answer is option B.
Question 10
1 / -0

Which of the following is called as a reduction division in the formation of new cells?

A
Meiosis

B
Mitosis

C
Cytokinesis

D
All of the above

Solution

Meiosis is a reductive cell division, whereby the number of chromosomes in the daughter cells is reduced by half, to produce haploid gametes (meiosis). Meiosis results in four haploid daughter cells by undergoing one round of DNA replication followed by two divisions: homologous chromosomes are separated in the first division, and sister chromatids are separated in the second division.
So, the correct answer is option A.

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Cell Cycle and Cell Division Test - 32

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Cell Cycle and Cell Division Test - 32

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Question 1

Movement of chromosomes towards poles

Cytoplasmic cleavage

Crossing over

Transcription process

Solution

Question 2

One round of DNA replication and one division

Two round of DNA replication and one division

Two round of DNA replication and two division

One round of DNA replication and two division

Solution

Question 3

G$$_1$$ phase

S phase

G$$_2$$ phase

M phase

Solution

Question 4

One

Two

Four

Eight

Solution

Question 5

Starting of G$$_1$$

End of G$$_1$$

Initial stage of prophase

End of telophase

Solution

Question 6

Produce four cells having chromosomal number equal to mother cell.

Occurs in all types of cells.

Maintains the constant chromosomes number of a particular species.

Growth of animal body organs.

Solution

Question 7

During telophase

During S phase

During G$$_2$$ stage of prophase

During entire prophase

Solution

Question 8

Anther

Root tip

Leaf tip

Ovary

Solution

Question 9

Mitosis

Meiosis

Both A and B

None of the above

Solution

Question 10

Meiosis

Mitosis

Cytokinesis

All of the above

Solution

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