Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Which of the phases of mitosis is the longest ?

A
Prophase

B
Metaphase

C
Anaphase

D
Telophase

Solution

The longest phase of mitosis is prophase. During prophase, which occurs after $$G_2$$ of interphase, the cell prepares to divide by tightly condensing its chromosomes and initiates mitotic spindle formation. The chromatin fibers condenses into discrete chromosomes. The nucleolus also disappears during early prophase.
So, the correct option is 'A'.
Question 2
1 / -0

In a bone marrow cell, each chromosome at metaphase stage has

A
One chromatid

B
Two chromatids

C
Several chromatids

D
No chromatids
Question 3
1 / -0

The stage of cell cycle when cell decides to undergone differentiation is ________.

A
$$G_0$$

B
$$G_1$$

C
$$G_3$$

D
$$G_4$$

Solution

Cell differentiation is the stage where cell loses its ability to divide and in this stage cell is specialized in a particular type of function. As we know in the cell cycle cell grows in the $$G_1$$ phase and after that cell decides to undergone differentiation in $$G_0$$ phase where cell decides to either grow special function by differentiate or enter into the S phase.
So, the correct option is A.
Question 4
1 / -0

In which stage the chromosomes appear thin and long thread-like?

A
Zygotene

B
Leptotene

C
Pachytene

D
Prophase
Question 5
1 / -0

$$G_1$$ stage of interphase of cell cycle shows

A
Active synthesis of DNA

B
Active synthesis of RNA

C
Active synthesis of protein

D
Both B and C

Solution

Interphase is composed of $$G_1$$ phase (cell growth), followed by S phase (DNA synthesis), followed by $$G_2$$ phase (cell growth). At the end of interphase comes the mitotic phase, which is made up of mitosis and cytokinesis and leads to the formation of two daughter cells. G1 phase together with the S phase and $$G_2$$ phase comprise the long growth period of the cell cycle cell division called interphase that takes place before cell division in mitosis (M phase). During $$G_1$$ phase, the cell grows in size and synthesizes mRNA and protein that are required for DNA synthesis.
So, the correct option is D.
Question 6
1 / -0

In mitosis, nuclear envelope and nucleolus disappear during ___________.

A
Prophase

B
Interphase

C
Metaphase

D
Telophase
Solution
- In prophase, the complex of DNA and histone proteins around which DNA is wrapped contained in the nucleus, known as chromatin, condense resulting in the formation of visible chromosomes.
- Simultaneously, the nucleolus disappears and the nuclear envelope breaks down.
- During interphase, the cell grows and the nuclear DNA is duplicated. It is followed by the mitotic phase.
- During metaphase, the chromosomes align themselves in the middle of the cell forming a metaphasic plate.
- During telophase, a nuclear membrane forms around each set of chromosomes to separate the nuclear DNA from the cytoplasm.
So, the correct answer is option A.
Question 7
1 / -0

If mitotic division is restricted in $$G_1$$ phase of cell, the condition is known as ____________.

A
$$G_2-phase$$

B
$$S-phase$$

C
$$G_0-phase$$

D
$$M-phase$$

Solution

After M ‐ phase (mitotic phase) a cell may either enter interphase or Go phase. Go phase is the stage when cell cycle is arrested. Therefore, further divisions stop.
So, the correct option is 'C'.
Question 8
1 / -0

During prophase, chromosomes are

A
Large and coiled

B
Large and straight

C
Thick and uncoiled

D
Thick and straight

Solution

During prophase, the nucleus contains DNA and proteins which condenses into chromatin. The chromatin becomes chromosomes and enlarges in size and duplicated chromosomes get highly coiled.
So, the answer is 'Large and coiled'.
Question 9
1 / -0

Significance of meiosis lies in

A
Production of genetic variability.

B
Ensuring exchange of maternal and parental genes during crossing over.

C
Ensuring the offspring has the same chromosome number as that of parents.

D
All of the above
Question 10
1 / -0

Spindle fibres are attached to chromosomes in the region of

A
Centrosome

B
Chromomere

C
Chromonema

D
Kinetochore

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Re-Attempt Weekly Quiz Competition

Cell Cycle and Cell Division Test - 49

Result

Cell Cycle and Cell Division Test - 49

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SHARING IS CARING

Question 1

Prophase

Metaphase

Anaphase

Telophase

Solution

Question 2

One chromatid

Two chromatids

Several chromatids

No chromatids

Question 3

$$G_0$$

$$G_1$$

$$G_3$$

$$G_4$$

Solution

Question 4

Zygotene

Leptotene

Pachytene

Prophase

Question 5

Active synthesis of DNA

Active synthesis of RNA

Active synthesis of protein

Both B and C

Solution

Question 6

Prophase

Interphase

Metaphase

Telophase

Solution

Question 7

$$G_2-phase$$

$$S-phase$$

$$G_0-phase$$

$$M-phase$$

Solution

Question 8

Large and coiled

Large and straight

Thick and uncoiled

Thick and straight

Solution

Question 9

Production of genetic variability.

Ensuring exchange of maternal and parental genes during crossing over.

Ensuring the offspring has the same chromosome number as that of parents.

All of the above

Question 10

Centrosome

Chromomere

Chromonema

Kinetochore

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