1.1 Phases of Cell Cycle

Question 1

Topic - Phases of Cell Cycle

Answer 1

I. Duration for every cell is same?
II. Duration of Human Cells or Yeast
III. Cell cycle phases

Question 2

A typical eukaryotic cell cycle is illustrated by
human cells in culture.
T/F

Answer 2

True

Question 3

The duration of the Cell cycle is the same for every cell.
T/F

Answer 3

False,
It is different for different organisms and their cell type.

Question 4

The human cell divides once in approximately ____ hrs.

Answer 4

24

Question 5

The cell cycle of Yeast about ____ minutes.

Answer 5

only 90 minutes

Question 6

The Cell cycle is divided into basic phases:

Answer 6

I. Interphase (resting phase)

II. M-phase (Mitosis phase when actual cell division)

Question 7

Topic - Interphase

Answer 7

I. Represents __
II. % of total duration of cell cycle
III. Cell is preparing for
IV. Divided into phases:

Question 8

Interphase represents:

Answer 8

Phase between two successive M phases

Question 9

The interphase lasts more than ____ % of the duration of cell cycle.

Answer 9

95

Question 10

In Interphase, a cell is preparing for division by ______ and ______ in a orderly manner.

Answer 10

cell growth and DNA replication

Question 11

Interphase is divided into 3 phases:

Answer 11

I. G1 phase (Gap 1 or Antephase)
II. S phase (Synthesis)
III. G2 phase (Gap 2)

Question 12

Topic - G1 phase

Answer 12

I. Interval btw _ & _
II. Main events

Question 13

______ phase is first growth phase.

Answer 13

G1 phase

Question 14

______ phase is the longest phase.

Answer 14

G1 phase

Question 15

G1 phase corresponds to the interval between ______ and ______.

Answer 15

mitosis and initiation of DNA replication

Question 16

Main events of G1 phase:

Answer 16

I. Continuous growth of cell
II. Cell becomes metabolically active
III. Prepare machinery for DNA replication
IV. Synthesizes RNA and proteins

Question 17

Topic - S phase

Answer 17

I. Main events
II. DNA amount & chromosomes no.
III. diploid becomes __
IV. In animals cells?

Question 18

Main events of S phase is:

Answer 18

I. DNA replication takes place
II. Amount of DNA per cell doubles (from 2C to 4C)

Question 19

During S phase, chromosome number is increased.
T/F

Answer 19

False,
Chromosome number is not increased.

Question 20

During the S-phase, if the cell is diploid (2n), then after S-phase, it becomes haploid.
T/F

Answer 20

False,
It remains diploid (2n)

Question 21

In the S-phase of animal cells, what happens?

Answer 21

I. DNA replication begins in the nucleus
II. Centriole or centromere duplicates in the cytoplasm

Question 22

Topic - G2 phase

Answer 22

I. Main events
II. Are DNA molecules intertwined?

Question 23

______ is second growth phase.

Answer 23

G2 phase

Question 24

Main events of G₂ phase is:

Answer 24

I. Cell growth continues.
II. Synthesis of RNA and proteins continues
III. Cell is prepared for mitosis

Question 25

In the ____ and ____ phases, the new DNA
molecules formed are not distinct but intertwined.

Answer 25

S and G2 phases

Question 26

Topic - G0 phase

Answer 26

I. What happen
II. Also called
III. Depends on the requirement, _
IV. Examples of Cells that do not divide
V. Some cells occasionally divide or not

Question 27

The cells that do not divide further exit the _____ phase to enter an inactive stage called ______ stage.

Answer 27

G1 phase; G0 or quiescent stage

Question 28

Depending on the organism’s requirement, cells of G0 stage remain ______ active but no longer ______ unless called on to do so.

Answer 28

Metabolically active; proliferate

Question 29

Some cells in adult animals do not appear to exhibit division. Examples.

Answer 29

Heart cells

Question 30

Many other cells divide only occasionally to replace cells lost because of injury or cell death.
T/F

Answer 30

True