Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

If 2n = 8, what shall be the number of chromatids in each daughter cell after meiosis 1?

A
4

B
16

C
2

D
8

Solution

Meiosis I is reductional division. Hence if the mother cell has 8 chromosomes, after meiosis I the progeny cells will have 4 chromosomes or 8 chromatids.
Question 2
1 / -0

Fibroblast cells in our body are arrested in

A
G$$_0$$ phase

B
G$$_1$$ phase

C
G$$_2$$ phase

D
M phase
Question 3
1 / -0

During gamete formation, the enzyme recombinase plays active role during

A
Prophase I

B
Prophase II

C
Metaphase I

D
Anaphase II

Solution

Meiosis occurs in two stages Meiosis I and Meiosis II. Crossing over and reduction in chromosome number occurs during meiosis I. The meiosis I is completed in stages like prophase I, metaphase I, anaphase I and telophase I. The prophase I is a very elaborate and complex stage. It comprises of leptotene, zygotene, pachytene, diplotene and diakinesis. The crossing over occurs in pachytene stage between non-sister chromatids of same bivalent. The crossing over is a complex enzyme catalysed process. The recombinase enzyme complex carries out crossing over in the pachytene sub-stage of prophase I stage of meiosis I of meiotic cell division.
So, the correct answer is option A.
Question 4
1 / -0

Cells in G$$_o$$ phase of cell cycle

A
Enter cell cycle

B
Terminate cell cycle

C
Suspend cell cycle

D
Both B and C

Solution

G0 is referred to as G zero phase or resting phase of the cell cycle in which cell exist in a quiescent state. It is a phase in which the cell does not divides nor shows a chance to divide, rather may stop until and unless a signal is triggered for G1 stage.
So, the correct option is (D).
Question 5
1 / -0

In cell cycle, quiescent refers to which of the following phase?

A
G$$_o$$

B
G$$_1$$

C
G$$_2$$

D
S

Solution

The interphase of cell cycle normally comprises of first growth phase (G$$_1$$ phase), synthesis phase (S phase) and second growth phase (G$$_2$$ phase). Some cells pass on to G$$_o$$ phase. It is a phase of cell quiescence when cell cycle is stopped before the middle of G$$_1$$ phase due to the absence of cycling factors. They do not grow or differentiate but remain metabolically active to function as reserve cells.
So, the correct answer is option A.
Question 6
1 / -0

In meiosis I, a bivalent is an association of

A
Four chromatids and four centromeres.

B
Two chromatids and two centromeres.

C
Two chromatids and one centromere.

D
Four chromatids and two centromeres.

Solution

Pairing of homologous chromosomes is a defining characteristic of meiosis and distinguishes meiosis from mitosis. Homologous chromosomes pair during prophase stage of meiosis I. In the prophase stage of meiosis I, when homologous chromosomes pair, structures called as bivalents are produced which comprise of two homologous chromosomes each. Each chromosome of each bivalent structure, in turn comprises of two sister chromatids joined at the centromere. Thus, each bivalent is actually a tetrad of chromatids - two sister and two non-sister chromatids. Two chromatids joined together at the centromere are called sister chromatids and two chromatids which are not joined at the centromere, nevertheless are a part of same bivalent are called non-sister chromatids. Each bivalent shall possess two centromere - one each from the two homologous chromosomes.
Question 7
1 / -0

The trigger protein, which is required by cell to pass through restriction point is

A
T protein

B
P protein

C
U protein

D
R protein

Solution

The G$$_1$$ phase is marked by the synthesis of RNA, ribosomes and proteins and maximum growth occurs in this phase. Certain cytological conditions arise in G$$_1$$ phase, which is necessary to induce a cell to divide, otherwise the cell cycle is arrested or restricted. This restriction point occurs in late G$$_1$$ phase. Once the cell has passed restriction point, it will complete the rest of the cell cycle. Cells need to accumulate a certain level of trigger proteins, called U-proteins, in order to pass through this restriction point.
So, the correct answer is option C.
Question 8
1 / -0

DNA is ............, in G$$_2$$ phase of cell cycle.

A
$$2N$$

B
$$N$$

C
$$3N$$

D
$$4N$$

Solution

A normal cell cycle comprises of interphase and mitosis. The interphase normally comprises of first growth phase (G$$_1$$ phase), synthesis phase (S phase) and second growth phase (G$$_2$$ phase). Because G$$_2$$ phase follows the S phase and precedes the M phase, the DNA content is 4N. Twice the amount of DNA is expected in a cell in G$$_2$$ phase as compared to a cell in G$$_1$$ phase as it has been duplicated during S phase.
So, the correct answer is option A.
Question 9
1 / -0

In an eukaryotice cell number of chromosomes are 36. After meiosis I and II, it results into 4 daughter cells. Then each daughter cell will have how many chromosomes?

A
36

B
18

C
9

D
27

Solution

Meiosis is the reductional division. Meiosis results in reduction of chromosome number to one half in the normal diploid cell. Thus, if a cell has 36 chromosome before meiosis. After meiosis the four daughter cells produced will be having 18 chromosomes each.
Question 10
1 / -0

Histone proteins are synthesized in a eukaryotic cell,

A
During entire prophase

B
During telophase

C
During S phase

D
During G$$_2$$ stage of prophase

Solution

A normal cell cycle comprises of interphase and mitosis. The interphase normally comprises of first growth phase (G$$_1$$ phase) which starts immediately after the cytokinesis, synthesis phase (S phase) and second growth phase (G$$_2$$ phase). The DNA synthesis or DNA replication occurs during S phase. DNA synthesis occurs through DNA replication. This is followed by synthesis of histones. Synthesis of other biochemicals also continues. Centrioles replicate towards the end of S phase or beginning of G$$_2$$ phase.
So, the correct answer is option C.

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Cell Cycle and Cell Division Test - 25

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Cell Cycle and Cell Division Test - 25

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Question 1

4

16

2

8

Solution

Question 2

G$$_0$$ phase

G$$_1$$ phase

G$$_2$$ phase

M phase

Question 3

Prophase I

Prophase II

Metaphase I

Anaphase II

Solution

Question 4

Enter cell cycle

Terminate cell cycle

Suspend cell cycle

Both B and C

Solution

Question 5

G$$_o$$

G$$_1$$

G$$_2$$

S

Solution

Question 6

Four chromatids and four centromeres.

Two chromatids and two centromeres.

Two chromatids and one centromere.

Four chromatids and two centromeres.

Solution

Question 7

T protein

P protein

U protein

R protein

Solution

Question 8

$$2N$$

$$N$$

$$3N$$

$$4N$$

Solution

Question 9

36

18

9

27

Solution

Question 10

During entire prophase

During telophase

During S phase

During G$$_2$$ stage of prophase

Solution

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