Cell Biology Test

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Cell Biology Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the stage of inactivation of cell cycle due to non-availability of mitogens and energy rich compounds?

A
G₁-Phase

B
S-Phase

C
G₂-Phase

D
G₀-Phase

Solution

This is the correct option. G₀-Phase is the stage of inactivation of cell cycle due to non-availability of mitogens and energy rich compounds. Cells in this stage remain metabolically active but no longer proliferate i.e., do not grow .
Question 2
1 / -0

Which of the following statements is/are false?

a. Generation time is the time interval between two cell cycles and varies from a few minutes to a few days.
b. Cyclin dependent protein kinases controls various phases of the cell cycle.

A
Both the statements are true.

B
Both the statements are false.

C
Statement 'a' is true and 'b' is false.

D
Statement 'b' is true and 'a' is false.

Solution

This is the correct option as both the statements are true. Generation time is the time interval between two cell cycles and varies from a few minutes to a few days. It depends upon the type of cell and its environmental conditions. Cyclin dependent protein kinases controls various phases of the cell cycle.
Question 3
1 / -0

Mitosis is the most common method of division which brings about growth in multicellular organisms. Which of the following is/are the significance of mitosis?

A
Maintenance of surface/volume ratio

B
Maintenance of nucleocytoplasmic ratio

C
Maintenance of chromosome number

D
All of these

Solution

The significance of the mitotic cell division are:

Mitosis keeps chromosome number constant.
Maintains genetic stability in daughter cells.
Helps in the maintenance of surface/volume ratio and nucleocytoplasmic ratio.
Question 4
1 / -0

Cell division is the process of formation of new or daughter cells from the pre-existing or parent cells. Which of the following factors control(s) cell division?

a. Cell size
b. Kernplasma ratio
c. Mitogens

A
Only a

B
Only a and b

C
Only c

D
All of these

Solution

The factors which control cell division are:

Cell Size: Cells are capable of division grow for some time, attain a particular size and then undergo division.

Kernplasma or Karyoplasmic Ratio: Rise in cell volume disturbs kernpklasma ratio. It stimulates the cell to divide.

Mitogens:Mitogens are agents, factors or substances that triger cell division. The common plant mitogen is hormone cytokinin. There are several mitogenic substances known in human beings, e.g., lymphokines, EGF (epidermal growth factor), PDGF (Platelet derived growth factor).
Question 5
1 / -0

G₂-Phase prepares the cell to undergo division. Which of the following is the characteristic of G₂-Phase?

A
This phase synthesises RNAs, proteins and other biochemicals for spindle formation and M-Phase division.

B
Cell organelles do not increase in number.

C
Cell grows in size but the growth of nucleus is little.

D
It is the first substage of interphase.

Solution

Th G₂-Phase synthesises RNAs, proteins and other biochemicals for spindle formation and M-Phase division. Both cell and nucleus grow in the G₂ Phase. The cell also undergoes a check phase at this stage.
Question 6
1 / -0

Cell division occurs in three ways. Which of the following cell divisions is/are called direct cell division(s)?

a. Amitosis
b. Mitosis
c. Meiosis

A
Only a

B
Only a and b

C
Only a and c

D
Only b and c

Solution

This is the correct option. Amitosis is a simple method of cell division which is also called direct cell division. In this, there is no differentiation of chromosomes and spindle. There is first a simple cleavage of the nucleus without change in its structure (such as the formation of chromosomes), followed by the division of the cytoplasm.
Question 7
1 / -0

Read the following statements and answer accordingly:

a. In anaphase, differentiation between cytoplasm and nucleoplasm disappears and endoplasmic reticulum and Golgi complex disorganise.
b. Mitosis is often named as somatic cell division as it occurs in the formation of somatic body cells.

A
Both the statements are true.

B
Both the statements are false.

C
Statement 'a' is false and 'b' is true.

D
Statement 'b' is false and 'a' is true.

Solution

This is the correct option as statement 'a' is false. In prometaphase, differentiation between cytoplasm and nucleoplasm disappears and endoplasmic reticulum and Golgi complex disorganise.
Question 8
1 / -0

Prophase is often studied in three substages. In which of the following stages, chromosomes shift towards the periphery so as to leave a clear central area?

a. Early prophase
b. Middle prophase
c. Late prophase

A
Only a

B
Only b

C
Only c

D
Only a and c

Solution

This is the correct option. In middle prophase, chromosomes shift towards the periphery so as to leave a clear central area. Simultaneously, they shorten and thicken further to assume characteristic shape and size.
Question 9
1 / -0

In which of the following stages of karyokinesis, the cytoplasmic viscosity decreases and two chromosome groups reorganise themselves into nuclei?

A
Metaphase

B
Prophase

C
Telophase

D
Anaphase

Solution

Telophase is technically the final stage of mitosis. During this phase, the sister chromatids reach opposite poles. The small nuclear vesicles in the cell begin to re-form around the group of chromosomes at each end. In telophase, the cytoplasmic viscosity decreases and two chromosome groups reorganise themselves into nuclei.
Question 10
1 / -0

Plant cytokinesis is different from animal cytokinesis due to the presence of a solid cell wall on the outside. Which of the following is a characteristic of plant cytokinesis?

A
It takes place by cleavage method.

B
The spindle begins to degenerate soon after anaphase.

C
A mid body of dense fibrous and vesicular material is formed in the middle.

D
The new cell membrane is derived from vesicles of Golgi apparatus.

Solution

In plant cytokinesis, the new cell membrane is derived from the vesicles of Golgi apparatus.

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Cell Biology Test - 13

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Cell Biology Test - 13

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Question 1

G1-Phase

S-Phase

G2-Phase

G0-Phase

Solution

Question 2

Both the statements are true.

Both the statements are false.

Statement 'a' is true and 'b' is false.

Statement 'b' is true and 'a' is false.

Solution

Question 3

Maintenance of surface/volume ratio

Maintenance of nucleocytoplasmic ratio

Maintenance of chromosome number

All of these

Solution

Question 4

Only a

Only a and b

Only c

All of these

Solution

Question 5

This phase synthesises RNAs, proteins and other biochemicals for spindle formation and M-Phase division.

Cell organelles do not increase in number.

Cell grows in size but the growth of nucleus is little.

It is the first substage of interphase.

Solution

Question 6

Only a

Only a and b

Only a and c

Only b and c

Solution

Question 7

Both the statements are true.

Both the statements are false.

Statement 'a' is false and 'b' is true.

Statement 'b' is false and 'a' is true.

Solution

Question 8

Only a

Only b

Only c

Only a and c

Solution

Question 9

Metaphase

Prophase

Telophase

Anaphase

Solution

Question 10

It takes place by cleavage method.

The spindle begins to degenerate soon after anaphase.

A mid body of dense fibrous and vesicular material is formed in the middle.

The new cell membrane is derived from vesicles of Golgi apparatus.

Solution

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G₁-Phase

G₂-Phase

G₀-Phase