Cell Cycle, Division and Chromatin - Cell Biology - Life Sciences Previous Year Questions

1

2007 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2007

Group I	Group II
P. Chromosome cycle	1. Interval between mitosis and DNA replication
Q. G1 phase	2. Helps in removing the excess salts
R. Salt glands	3. Behavior of the cell as they grow and divide
S. Tunica-corpus	4. Organization of apical meristem based on a single apical cell
	5. Concept of tissue differentiation at shoot apical meristem
	6. Replication and partitioning of the genome into two daughter cells

A

P-1, Q-6, R-3, S-4

B

P-2, Q-1, R-6, S-5

C

P-3, Q-6, R-4, S-5

D

P-6, Q-1, R-2, S-5

Open complete paper

2

2008 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2008

Identify the correct statements for the ‘HAT medium’

A

Includes drug aminopterin to block major pathway for synthesis of deoxyribonucleotides

B

Hypoxanthine is precursor for thymidine

C

Includes drug aminopterin to block major pathway for synthesis of polypeptides

D

Cells can grow in presence of aminopterin only if they have enzymes thymidine kinase and hypoxanthine-guanine phosphoribosyl transferase

Open complete paper

3

2009 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2009

Caspases are involved in the process of

A

DNA replication

B

Mutation and recombination

C

Antibody synthesis

D

Apoptosis

Open complete paper

4

2009 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2009

Which of the following statements hold true for pluripotent stem cells (PSCs) under in vitro conditions ?
P. PSCs can be maintained in an undifferentiated state.
Q. PSCs exhibit abnormal and unstable karyotypes.
R. PSCs can differentiate into a wide variety of cell types.
S. PSCs cannot be passaged continuously.

A

P, Q

B

P, R

C

Q, R

D

Q, S

Open complete paper

5

2009 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2009

Which of the following combination of statements regarding Maturation Promoting Factor (MPF) is TRUE ?
1. MPF in amphibians regulates cell cycle.
2. MPF in amphibians is composed of cyclins and CDKs.
3. MPF in amphibians undergoes periodic degradation.
4. MPF in amphibians undergoes periodic phosphorylation.

A

1, 2 and 3 only

B

1 and 4 only

C

2 and 3 only

D

1, 2, 3 and 4

Open complete paper

6

2010 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2010

Study the following diagram depicting the plant cell cycle and match the following

A

P-4,Q-3,R-1,S-2

B

P-2,Q-3,R-1,S-4

C

P-1,Q-4,R-3,S-2

D

P-3,Q-1,R-2,S-4

Open complete paper

7

2011 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2011

Cytochrome C is normally found in the inner mitochondrial membrane. It is released into the cytoplasm during

A

Apoptosis

B

Necrosis

C

Cell differentiation

D

Cell proliferation

Open complete paper

8

2011 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2011

In which one of the following phases of cell cycle the drug colchicine exerts its effect?

A

G1

B

G2

C

S

D

M

Open complete paper

9

2013 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2013

Identify the event that exclusively occurs in meiotic cell division

A

Chromatid formation

B

Spindle formation

C

Synapsis

D

Chromosome movement to pole

Open complete paper

10

2013 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2013

Control mechanisms operate at any of the several steps involved in gene expression. Which one of the following is the key mode of regulation during the cell cycle?

A

Transcription

B

mRNA processing

C

Activation of protein function resulting from protein-protein interaction

D

mRNA export

Open complete paper

11

2014 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2014

Statements given below are either TRUE (T) or FALSE (F). Find the correct combination.
P. Regulation of cell cycle progression depends on cyclin dependent kinase (CDK) and protease activity.
Q. In photosynthesis, oxidation of water produces O₂ and releases electrons required by photosystem I (PSI).
R. Photorespiratory reaction occurring in oxidative photosynthetic carbon (C₂) pathway involves a cooperative interaction among three organelles: chloroplast, peroxisome and mitochondria.
S. Ethylene acts as a promoter of senescence, and cytokinins act as a senescence antagonist.

A

P-T, Q-F, R-T, S-F

B

P-T, Q-T, R-T, S-F

C

P-T, Q-F, R-F, S-T

D

P-T, Q-F, R-T, S-T

Open complete paper

12

2017 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2017

The duration of DNA synthesis (S phase) in plant cells is 11 h and the DNA is replicated at a rate of 100 bp/s/fork. A plant species has about 3.0x10^10 bp DNA/genome. The number of bidirectional forks per genome required for replication will be ....................

Check answer

Open complete paper

13

2017 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2017

Which one of the following statements is NOT correct?

A

During metaphase, the 2 copies of chromosomal DNA are held together at the centromere

B

The short arm of chromosomes is referred to as p and the long arm is referred to as q

C

The terminal structures at the end of the chromatids are referred to as telomeres

D

The terms heterochromatin and euchromatin refer to the active and repressed regions of the chromosome respectively

Open complete paper

14

2017 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2017

A cell in G1 phase has 16 chromosomes. The total number of chromatids that would be found per cell during Metaphase II of meiosis are ______

Check answer

Open complete paper

15

2018 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2018

Statements given below are either TRUE (T) or FALSE (F). Select the CORRECT combination.
P. Mitosis occurs exclusively in diploid mother cell
Q. Mitosis occurs both in diploid and haploid mother cells
R. Meiosis occurs exclusively in diploid mother cell
S. Meiosis occurs both in diploid and haploid mother cells

A

P-T, Q-F, R-T, S-F

B

P-F, Q-T, R-F, S-T

C

P-T, Q-F, R-F, S-T

D

P-F, Q-T, R-T, S-F

Open complete paper

16

2018 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2018

Which ONE of the following is NOT a characteristic of a cancer cell?

A

Increase in cell motility

B

Loss of contact inhibition

C

Decrease in apoptosis

D

Uncontrolled meiosis

Open complete paper

17

2021 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2021

Which ONE of the following statements regarding spores and gametes is CORRECT?

A

Spores can directly undergo mitosis whereas gametes cannot.

B

Gametes can directly undergo mitosis whereas spores cannot.

C

Neither spores nor gametes can directly undergo mitosis.

D

Both spores and gametes can directly undergo mitosis.

Open complete paper

18

2021 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2021

Cohesin and Condensin proteins of eukaryotes belong to which one of the following groups?

A

Structural maintenance of chromosomes (SMC) proteins

B

Histones

C

DNA polymerases

D

Topoisomerases

Open complete paper

19

2023 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2023

A mature rat sperm cell has 2.5 μg of genomic DNA that is equivalent of a haploid genome. Compared to this sperm cell, the amount of genomic DNA (in μg) in a somatic cell, which is in the G2 phase of cell cycle, will be _____ (in integer).

Check answer

Open complete paper

20

2023 · Life Sciences · Cell Biology · Cell Cycle, Division and Chromatin

Life Sciences (XL) 2023

Which of the following statements is/are TRUE for Colchicine?

A

It binds to tubulin molecule and disrupts the assembly/polymerization of microtubule.

B

It inhibits crossover of chromosomes during meiosis.

C

It inhibits chromosome condensation during Prophase.

D

It blocks mitotic cells in Metaphase.

Check answer

Open complete paper