Select the correct option: I II ( a ) Synapsis aligns homologous chromosomes ( i ) Anaphase – II ( b ) Synthesis of RNA and protein ( i i ) Zygotene ( c ) Action of enzyme recombinase ( i i i ) G 2 – phase ( d ) Centromeres do not separate but chromatids move towards opposite poles ( i v ) Anaphase – I ( v ) Pachytene

( a ) ( i i ) ( b ) ( i i i ) ( c ) ( v ) ( d ) ( i v )

( a ) ( i i ) ( b ) ( i ) ( c ) ( i i i ) ( d ) ( i v )

( a ) ( i ) ( b ) ( i i ) ( c ) ( v ) ( d ) ( i v )

( a ) ( i i ) ( b ) ( i i i ) ( c ) ( i v ) ( d ) ( v )

Match the following with respect to meiosis (a) Zygotene (i) Terminalization (b) Pachytene (ii) Chiasmata (c) Diplotene (iii) Crossing over (d) Diakinesis (iv) Synapsis Select the correct option from the following

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

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

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

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

EASY

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What are the spindle fibres that connect the centromere of chromosomes to the respective poles called?

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Important Questions on Cell Cycle and Cell Division

MEDIUM

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

Match the stages of meiosis of Column-I to their characteristic features in Column-II and select the correct option using the codes given below:

Column-I		Column–II
a.	Pachytene	(i)	The pairing of homologous chromosomes
b.	Metaphase I	(ii)	Terminalization of chiasmata
c.	Diakinesis	(iii)	Crossing-over takes place
d.	Zygotene	(iv)	Chromosomes align at the equatorial plate

EASY

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

In meiosis, crossing over is initiated at _________.

MEDIUM

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

Select the correct option:

	I		II
( $a$ )	Synapsis aligns homologous chromosomes	( $i$ )	Anaphase – II
( $b$ )	Synthesis of RNA and protein	( $i i$ )	Zygotene
( $c$ )	Action of enzyme recombinase	( $i i i$ )	$G_{2}$ – phase
( $d$ )	Centromeres do not separate but chromatids move towards opposite poles	( $i v$ )	Anaphase – I
		( $v$ )	Pachytene

MEDIUM

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

After meiosis-II, daughter cells differ from the parent cells and each other in their genotypes. This can occur because of which one of the following mechanism (s)?

EASY

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

Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

EASY

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

Genetic content of a cell reduces to half during:

MEDIUM

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

Arrange the following events of meiosis in the correct sequence:

i. Crossing over

ii. Synapsis

iii. Terminalisation of chiasmata

iv. Disappearance of the nucleolus

EASY

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

During meiosis

I,

in which stage synapsis takes place?

HARD

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

A cell weighing

1 mg

grows to double its initial mass before dividing into two daughter cells of equal mass. Assuming no death, at the end of 100 divisions what will be the ratio of the mass of the entire population of these cells to that of the mass of the Earth? Assume that mass of the earth is

10^{24} kg

and

2^{10}

is approximately equal to 1000.

EASY

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

Which ONE of the following sequences of events CORRECTLY represents mitosis?

EASY

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

The enzyme recombinase is required at which stage of meiosis:

MEDIUM

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

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:

MEDIUM

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

Match the following with respect to meiosis

(a)	Zygotene	(i)	Terminalization
(b)	Pachytene	(ii)	Chiasmata
(c)	Diplotene	(iii)	Crossing over
(d)	Diakinesis	(iv)	Synapsis

Select the correct option from the following

EASY

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

Meiosis I and Meiosis II are characterised by the separation of:

EASY

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

Dissolution of the synaptonemal complex occurs during

MEDIUM

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

Arrange the following statements on meiosis in a correct sequence.
A) Terminalisation of chiasmata.
B) Dissolution of synaptonemal complex.
C) Homologous chromosome separation.
D) Appearance of recombination nodules.
E) Pairing of homologous chromosomes.
F) Disappearance of nuclear envelope.

EASY

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

Identify the event in meiosis mediated by the enzyme recombinase.

MEDIUM

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

By comparing mitosis and meiosis occurring in the same organism, which ONE of the following options is CORRECT regarding the DNA content per cell?

MEDIUM

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

Which of the following options gives the correct sequence of events during mitosis?

EASY

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

Which of the following is not a characteristic feature during mitosis in somatic cells?

What are the spindle fibres that connect the centromere of chromosomes to the respective poles called?

Important Questions on Cell Cycle and Cell Division

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