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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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?

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Important Questions on Cell Cycle and Cell Division

HARD

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

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

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

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

EASY

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

A single bacterium is actively growing in a medium that supports its growth to a number of 100 million. Assuming the division time of the bacterium as 3 hours and the life span of non-dividing bacteria as 5 hours, which ONE of the following represents the maximum number of bacteria that would be present at the end of 15 hour?

MEDIUM

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

Below features indicates which phase of mitosis?
(i) Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements
(ii) Nuclear envelope assembles around the chromosome clusters
(iii) Nucleolus, Golgi complex and ER reform

MEDIUM

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

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>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

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

Fill in the blanks
During metaphase, spindle fibres attach to ________.
Centromeres split and chromatids __________ during __________.

MEDIUM

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

Select the correct statements.

A. Tetrad formation is seen during the Leptotene.

B. During Anaphase, the centromeres split and chromatids separate.

C. Terminalization takes place during Pachytene.

D. Nucleolus, Golgi complex and ER are reformed during Telophase.

E. Crossing over takes place between sister chromatids of homologous chromosomes.

Choose the correct answer from the options given below:

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?

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?

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?

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

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)?

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

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?

MEDIUM

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

Select the incorrect match.

EASY

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

Spindle formation can be disuupted by exposing cell to the microtubule poison ?

EASY

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

Which ONE of the following statements about mitosis is CORRECT?

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?

Important Questions on Cell Cycle and Cell Division

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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?