Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

What comes in quiescent stage of interphase?

A
G $_{1}$

B
S

C
G $_{2}$

D
G $_{0}$

Solution

A- Gap 1 phase is the time during which the cell makes more proteins so that it can grow to its proper size.
B- Synthesis phase is the time during which the cell copies its DNA in preparation for mitosis.
C- Gap 2 phase is the time during which a cell replicates its organelles in preparation for meiosis.
D- G0 This phase is known as the quiescent stage of interphase, where the cells exit the cell cycle and enter this phase in order to differentiate.
So the correct option is 'Quiescent phase or G0 phase'.
Question 2
1 / -0

How do cells at the completion of meiosis compare with cells that have completed interphase and are just about to begin meiosis ?

A
They have same number of chromosomes and half the amount of DNA

B
They have half the number of chromosomes and same amount of DNA

C
They have same number of chromosomes and same amount of DNA

D
They have half the number of chromosomes and one fourth the amount of DNA

Solution

A- The cells produced at the end of meosis cell division have half the number of chromosomes (termed as Haploid), so they will have half the number of chromosomes but same DNA as that of the parent cell as DNA divides and makes a copy of the parent cell DNA.
Question 3
1 / -0

Identify the phase at which most organelles duplicates.

A
$M$ phase

B
$G_1$ phase

C
$G_0$ phase

D
$G_2$ phase

Solution

During the G $_{2}$ phase, the organelles are duplicated and the proteins required for the division are synthesized.
A. During M-phase the karyokinesis and cytokinesis occur. During the karyokinesis, the division of chromosomes occurs. After that, the cytoplasm is divided in cytokinesis.
B. During G $_{1}$ phase the machinery of proteins required for DNA replication occurs.
C. No division activity occurs during the G $_{0}$ phase, It is called the quiescent phase or resting phase.
D. During the G $_{2}$ phase, organelles are duplicated and the cell commits for the division.
Hence, the correct answer is 'G $_{2}$ phase'.
Question 4
1 / -0

In plant cell cytokinesis is marked by the appearance of the cell plate. Cell plate resembles

A
Plasma membrane

B
Primary cell wall

C
Secondary cell wall

D
middle lemella

Solution

In plant cells, cell wall formation starts in the centre of the cell and grows outwards to meet the existing lateral wall. The formation of new cell wall begins with the formation of a new simple precursor, called a cell plate that represents the middle lamella between the walls of two adjacent cells.
So, the correct answer to the question is Option D i,e, Middle lamella.
Question 5
1 / -0

What will be the amount of DNA in a pollen grain if its mother cell has 32 picogram DNA in G $_2$ phase?

A
16 pg

B
32 pg

C
8 pg

D
4 pg

Solution

G $_2$ phase comes after S phase. In S phase synthesis of DNA occurs. The amount of DNA doubles but the chromosome number or diploid content of the cell remains the same. So, if the mother cell has 32 picogram DNA in G $_2$ , this means originally the cell has 16 picogram of DNA.
The mother cell which forms the pollen grain is diploid and undergo meiosis to produce haploid pollen grains.
So, if the diploid mother cell has originally 16 picogram of DNA, the amount of DNA in haploid pollen grain would be equal to half of 16 i.e. 8 picogram.
So, the correct answer is '8 pg'.
Question 6
1 / -0

Suppose $10$ chromosomes and $14$ pg DNA present in each cell of onion root tip, what will be the number of chromosomes and amount of DNA present at anaphase of cell cycle?

A
$10$ and $28$ pg

B
$10$ and $14$ pg

C
$22$ and $10$ pg

D
$5$ and $7$ pg

Solution

The number of chromosomes and amount of DNA in the parent cell and number of chromosomes and amount of DNA during anaphase is same because in anaphase, movement of chromosomes takes place.
So, the correct option is '10 and 14pg'.
Question 7
1 / -0

Select an Incorrect statement w.r.t. metaphase.

A
Sphindle fibres are attached to small disc shaped structure at the surface of centromeres called kinetochores

B
The plane of alignment of the homonogous pair of chromosomes at metaphase is referred to as metaphasic plate.

C
Chromosomes appears to be made up two sister chromatids

D
The shape of chromosomes can be studied in this phase

Solution

Metaphase is the second phase of karyokinasis of both mitosis and meiosis.
In this chromosomes appears to be made up of two sister chromatids. Spindles fibres are attached to the kinetochores of centromere. In meiosis, homologous chromosomes are arranged along the centre or equator of the spindle apparatus. In this, structure of the chromosome can be studied.
So, the correct option is ' the shape of the chromosomes can be studied in this phase'.
Question 8
1 / -0

The diploid cell of a self conscious primate has $6$ pg DNA. What would be the DNA content in the cell at $G_2-$ phase of interphase during cell cycle?

A
$6$ pg

B
$12$ pg

C
$3$ pg

D
$24$ pg

Solution

DNA replication occurs in S phase and DNA amount doubles up i.e., a cell with 2C DNA in G1 phase will now have 4C DNA. G2 phase is the second growth phase where DNA content remains 4C.
So the correct option id '12 pg'
Question 9
1 / -0

Ratio of tractile fibre and chromosomes in metaphase is

A
$1:1$

B
$2:1$

C
$3:1$

D
$4:1$

Solution

During metaphase, as the nuclear membrane disappears, tractile fibers join or develop from kinetochore microtubular elements and extend. By contractile mode the tractile fibers bring all the chromosomes to their respective poles. The no. of tractile fibre and chromosomes in metaphase are equal.
So the correct answer is '1 : 1'.

Question 10

1 / -0

Match column I with column II and select the correct option from the given codes

	Column I		Column II
A.	V-shaped at anaphase	i	Acrocentric chromosome
B.	L-shaped at anaphase	ii	Metacentric chromosome
C.	J-shaped at anaphase	iii	Telocentric chromosome
D.	I-shaped at anaphase	iv	Sub-metacentric chromosome

A- (iv), B- (ii), C- (i), D -(iii)

A- (ii), B- (iv), C- (i), D -(iii)

A- (ii), B- (iv), C- (iii), D -(i)

A- (iv), B- (iii), C- (ii), D -(i)

Solution

During anaphase depending upon the position of the centromere, chromosomes are classified into four types metacentric, submetacentric, acrocentric and telocentric. Metacentric chromosomes have the centromere in the center, such that both sections are of roughly equal in length and appear V-shaped at anaphase. Submetacentric chromosomes have the centromere slightly offset from the center leading to a slight asymmetry in the length of the two sections and appear L-shaped at anaphase. The acrocentric chromosome has the centromere located quite near one end of the chromosome and appears J-shaped at anaphase. Telocentric chromosome have centromere is located at the terminal end of the chromosome and appear I-shaped at anaphase.

So. the correct answer is 'option B'

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Cell Cycle and Cell Division Test - 67

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Cell Cycle and Cell Division Test - 67

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Question 1

G1_{1}1​

S

G2_{2}2​

G0_{0}0​

Solution

Question 2

They have same number of chromosomes and half the amount of DNA

They have half the number of chromosomes and same amount of DNA

They have same number of chromosomes and same amount of DNA

They have half the number of chromosomes and one fourth the amount of DNA

Solution

Question 3

MMM phase

G1G_1G1​ phase

G0G_0G0​ phase

G2G_2G2​ phase

Solution

Question 4

Plasma membrane

Primary cell wall

Secondary cell wall

middle lemella

Solution

Question 5

16 pg

32 pg

8 pg

4 pg

Solution

Question 6

101010 and 282828 pg

101010 and 141414 pg

222222 and 101010 pg

555 and 777 pg

Solution

Question 7

Sphindle fibres are attached to small disc shaped structure at the surface of centromeres called kinetochores

The plane of alignment of the homonogous pair of chromosomes at metaphase is referred to as metaphasic plate.

Chromosomes appears to be made up two sister chromatids

The shape of chromosomes can be studied in this phase

Solution

Question 8

666 pg

121212 pg

333 pg

242424 pg

Solution

Question 9

1:11:11:1

2:12:12:1

3:13:13:1

4:14:14:1

Solution

Question 10

A- (iv), B- (ii), C- (i), D -(iii)

A- (ii), B- (iv), C- (i), D -(iii)

A- (ii), B- (iv), C- (iii), D -(i)

A- (iv), B- (iii), C- (ii), D -(i)

Solution

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G $_{1}$

G $_{2}$

G $_{0}$

$M$ phase

$G_1$ phase

$G_0$ phase

$G_2$ phase

$10$ and $28$ pg

$10$ and $14$ pg

$22$ and $10$ pg

$5$ and $7$ pg

$6$ pg

$12$ pg

$3$ pg

$24$ pg

$1:1$

$2:1$

$3:1$

$4:1$