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 )

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 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 )

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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If the nucleus represents its large size in proportion to the cytoplasm of the cell, it indicates that

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Important Questions on Cell Cycle and Cell Division

EASY

Biology>Cell: Structure and Functions>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?

EASY

Biology>Cell: Structure and Functions>Cell Cycle and Cell Division>Cell Cycle

Cell in the quiescent stage

(G_{0})

MEDIUM

Biology>Cell: Structure and Functions>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.

EASY

Biology>Cell: Structure and Functions>Cell Cycle and Cell Division>Cell Cycle

Select the incorrect statement of cell cycle.

EASY

Biology>Cell: Structure and Functions>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?

EASY

Biology>Cell: Structure and Functions>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.

MEDIUM

Biology>Cell: Structure and Functions>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: Structure and Functions>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:

EASY

Biology>Cell: Structure and Functions>Cell Cycle and Cell Division>Cell Cycle

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

MEDIUM

Biology>Cell: Structure and Functions>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: Structure and Functions>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

MEDIUM

Biology>Cell: Structure and Functions>Cell Cycle and Cell Division>Cell Cycle

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?

MEDIUM

Biology>Cell: Structure and Functions>Cell Cycle and Cell Division>Cell Cycle

The nucleus of a diploid organism contains