Cell Cycle

Q.

Identify the correct statement with regard to G1 phase (Gap I) of the interphase?

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

2. Nuclear division takes place

3. DNA synthesis or replication takes place

4. Reorganisation of all cell components takes place

Q.

Give two significance of mitosis.

Q. Totipotency means

1. Flowering in culture medium
2. Development of fruit from a flower in culture
3. Development of an organ from a cell in culture medium
4. All of the above

Q.

The term used to denote an increase in the number of cells to assist in the various needs of an organism is _____.

1. Cell growth

2. Cell development

3. Cell division

4. Cell improvement

Q.

DNA and histone proteins are synthesized during which of the following phase of the cell cycle?

1. S Phase

2. G1 Phase

3. G2 Phase

4. None Of These

Q. Why is DNA copying important during reproduction

Q.

The nucleus of a cell which is not undergoing division is called

1. Nucleoplasm

2. Nucleolus

3. All of these

4. Interphase nucleus

Q.

Human cells in culture show a cell cycle to be completed in approximately_________.

1. 42 hours

2. 12 hours

3. 24 hours

4. 6 hours

Q.

During which phase of the cell cycle is DNA synthesized?

1. G1

2. G2

3. S

4. M

Q.

What is the average cell cycle span of a human cell?

1. 17 Hrs

2. 20 Hrs

3. 24 Hrs

4. 30 Hrs

Q.

Mark the basic requirement(s) of a cell to undergo cell division.

1. Duplication of Cell organelles

2. All the above

3. Increase in cell size

4. Replication of Genetic material

Q.

In a cell cycle, which of these phases has the shortest duration?

1. Interphase

2. M phase

3. S phase

4. G phase

Q.

When cells do not need to divide further, which of the following phases do the cells enter into:

1. S phase

2. R phase

3. G1 phase

4. G2 phase

Q. Match the stages of the interphase with the characteristic events.

1. DNA replication
2. Prepare for mitosis
3. Organellar division
4. Resting phase

Q.

One important feature of mitosis is:

1. To ensure that the daughter cells resemble each other as well as the parent in genetic content.

2. To ensure that both the daughter cells get the same number of organelles

3. To ensure both the daughter cells receive the exact same amount of cytoplasm

4. To ensure that the nucleus is divided exactly in half

Q.

Identify the following phases 1, 2, 3, & 4 in a eukaryotic cell cycle.

1. M, G_1, S, G₂

2. G_2, M, G_1, S

3. S, G_2, M, G₁

4. G_1, S, G_2, M

Q.

In which period of the cell cycle do cells exist in a quiescent state?

Q.

Which of the following is true about the G1 phase of the cell cycle?

1. Supply of carbon dioxide increases

2. Protein synthesis increases

3. Supply of oxygen increases

4. Size of the vacuole increases

Q. Explain the following terms: [4 MARKS]
(i) Cell cycle (ii) Diploid cell (iii) Chromosome number

Q.

If a cell needs to quit dividing, it enters a state where it stagnates to carry its normal cell activity. This is called as the _____ phase.

1. M

2. S

3. G₂

4. G₀

Q. Mention the characteristic features of mitosis.

Q.

In the S phase of the cell cycle

1. Chromosome number is increased

2. Amount of DNA doubles in each cell

3. Amount of DNA remains the same in each cell

4. Amount of DNA is reduced to half in each cell.

Q.

Given below is a schematic break-up of the phases/stages of the cell cycle. Which of the following match is true?

1. A - Cytokinesis

2. C - Karyokinesis

3. B - Metaphase

4. D - Synthesis phase

Q.

Synthesis phase in the cell cycle is called so, because of the synthesis of more:

1. RNA

2. RNA and proteins

3. DNA

4. Glucose

Q.

A plant cell has 12 chromosomes at the end of mitosis. How many chromosomes would it have in the G2 phase of its next cell cycle?

1. 6

2. 12

3. 24

4. 8

Q.

Resting phase and the G0 phase are they two similar?

Q. Cells which are not dividing are likely to be at

1. S phase
   
2. $G_2$
3. $G_1$
4. $G_0$

Q.

Match the following time spans with their actual phases in a eukaryotic cell cycle.

Column I Column II

i). 10 hr a. M Phase

ii). 9 hr b. G₂ Phase

iii). 4 hr c. S Phase

iv). 1 hr d. G₁ Phase

1. i).➡ a., ii).➡ b., iii).➡ c., iv). ➡ d.

2. i).➡ d., ii).➡ c., iii).➡ b., iv). ➡ a.

3. i).➡ c., ii).➡ d., iii).➡ a., iv). ➡ b.

4. i).➡ b., ii).➡ a., iii).➡ d., iv). ➡ c.

Q. What do you understand by cell cycle?

Q.

Mark the basic requirement(s) for a cell to undergo cell division.

1. Duplication of Cell organelles

2. Increase in cell size

3. Replication of Genetic material

4. All the above