Match the following events that occur in their respective phases of the cell cycle and select the correct option: Column-I Column-II (a) G 1 phase (i) Cell grows and organelle duplication (b) S phase (ii) DNA replication and chromosome duplication (c) G 2 phase (iii) Cytoplasmic growth (d) Metaphase in M - phase (iv) Alignment of chromosomes

( a ) - ( i ) , ( b ) - ( ii ) , ( c ) - ( iii ) , ( d ) - ( iv )

( a ) - ( ii ) , ( b ) - ( iii ) , ( c ) - ( iv ) , ( d ) - ( i )

( a ) - ( iii ) , ( b ) - ( iv ) , ( c ) - ( i ) , ( d ) - ( ii )

( a ) - ( iv ) , ( b ) - ( i ) , ( c ) - ( ii ) , ( d ) - ( iii )

Identify the correct statement with regard to G 1 phase (Gap 1) of interphase.

Cell is metabolically active, grows but does not replicate its DNA.

Reorganisation of all cell components takes place.

DNA synthesis or replication takes place.

Match Column - I with Column - II. Column -I Column -II (a) S phase (i) Proteins are synthesized (b) G 2 phase (ii) Inactive phase (c) Quiescent stage (iii) Interval between mitosis and initiation of DNA replication (d) G 1 phase (iv) DNA replication Choose the correct answer from options given below.

( a ) - ( iv ) ; ( b ) - ( i ) ; ( c ) - ( ii ) ; ( d ) - ( iii )

( a ) - ( iii ) ; ( b ) - ( ii ) ; ( c ) - ( i ) ; ( d ) - ( iv )

( a ) - ( iv ) ; ( b ) - ( ii ) ; ( c ) - ( iii ) ; ( d ) - ( i )

( a ) - ( ii ) ; ( b ) - ( iv ) ; ( c ) - ( iii ) ; ( d ) - ( i )

The nucleus of a diploid organism contains 3 ng of DNA in G 1 phase. Which ONE of the following statement describes the state of the cell at the end of S phase?

The nucleus does not divide, and it contains 6 ng of DNA .

The nucleus divides into two, and each nucleus contains 3 ng of DNA .

The nucleus does not divide, and it contains 3 ng of DNA .

The nucleus divides into two, and each nucleus contains 1 . 5 ng of DNA .

MEDIUM

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Which of the following best describes the DNA content and the number of chromosomes at the end of S and M phases of the cell cycle in mitosis, if the DNA content of the cell at the beginning of the cell cycle (G1 phase) is considered as C and the number of chromosomes 2 N?

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Important Questions on Cell Cycle and Cell Division

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

' G_{0}'

' stage of the cell cycle is characterized by ________

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

The fruit fly has

8

chromosomes

(2 n)

in each cell. During the interphase of mitosis if the number of chromosomes at

G_{1}

phase is

8 .

What would be the number of chromosomes after the S phase?

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

If onion root tip cell has

14

chromosomes and DNA content as

2 C,

what are the number of chromosomes and DNA content during

G_{1}, S

and

G_{2}

phases respectively?

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Match the following events that occur in their respective phases of the cell cycle and select the correct option:

Column-I		Column-II
(a)	$G_{1}$ phase	(i)	Cell grows and organelle duplication
(b)	$S$ phase	(ii)	$DNA$ replication and chromosome duplication
(c)	$G_{2}$ phase	(iii)	Cytoplasmic growth
(d)	Metaphase in $M -$ phase	(iv)	Alignment of chromosomes

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Identify the correct statement with regard to G₁ phase (Gap 1) of interphase.

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Select the incorrect statement of cell cycle.

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Match Column - I with Column - II.

Column -I		Column -II
(a)	$S$ phase	(i)	Proteins are synthesized
(b)	$G_{2}$ phase	(ii)	Inactive phase
(c)	Quiescent stage	(iii)	Interval between mitosis and initiation of DNA replication
(d)	$G_{1}$ phase	(iv)	DNA replication

Choose the correct answer from options given below.

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Given below are two statements:

Statement I: During G₀phase of cell cycle, the cell is metabolically inactive.

Statement II: The centrosome undergoes duplication during S phase of the interphase.

In the light of the above statements, choose the most appropriate answer from the options given below:

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Arrange the following events of mitotic cell cycle in series
a) Reformation of nucleolus, Golgi complex and

ER

b) Amount of

DNA

per cell doubles
c) Disappearance of Golgi complex and

ER

d) Condensation of chromatin into chromosome
e) Distribution of mitochondria and plastids to daughter cells
f) Separation of chromatids at centromere

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Gene

P^{53}

guards integrity of

DNA

and hence called 'Guardian Angel of Cell's genome'. It checks the integrity of

DNA

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

The nucleus of a diploid organism contains

3 ng

DNA

G_{1}

phase. Which ONE of the following statement describes the state of the cell at the end of

S

phase?

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Following the cell cycle scheme given below, what is the probability that a cell would be in M-phase at any given time?

Question Image

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

The number of chromatids present in a human cell in the

G_{2}

phase, prophase, post-cytokinesis and

G_{1}

phase, respectively are:

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Choose the incorrect statements among the following.
A) Cells of the lining of the gut are replaced by mitotic division constantly
B) Formation of liquid endosperm takes place, if karyokinesis is not followed by cytokinesis
C) In telophase, the chromosomes reach the poles and condenses to form the chromatic network
D) In quiescent stage, the cell is metabolically inactive.

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Match List I with List II:

List I	List II
A. M phase	I. Proteins are synthesized
B. G₂Phase	II. Inactive phase
C. Quiescent stage	III. Interval between mitosis and initiation of DNA replication
D. G₁ Phase	IV. Equational Division

Choose the correct answer from the options given below:

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Arrange the following events of meiosis in the correct sequence:

i. Crossing over

ii. Synapsis

iii. Terminalisation of chiasmata

iv. Disappearance of the nucleolus

MEDIUM

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

A cell at the telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at the telophase stage. There is no formation of the cell plate and thus the cell is containing more chromosomes as compared to other dividing cells. This would result in:

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

Cell in the quiescent stage

(G_{0})

EASY

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4 C level if the initial amount is denoted as 2C?

HARD

Biology>Cell and Molecular Biology>Cell Cycle and Cell Division>Cell Cycle

A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has:

Which of the following best describes the DNA content and the number of chromosomes at the end of S and M phases of the cell cycle in mitosis, if the DNA content of the cell at the beginning of the cell cycle (G1 phase) is considered as C and the number of chromosomes 2 N?

Important Questions on Cell Cycle and Cell Division

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