Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 44

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Weekly Quiz Competition

Question 1
1 / -0

The important event of meiosis is the crossing over. It occurs during

A
Leptotene

B
Pachytene

C
Diplotene

D
Zygotene

Solution

The pairing of homologous chromosomes is a defining characteristic of meiosis. Homologous chromosomes pair during prophase stage of meiosis I. The prophase stage of meiosis I have substages, leptotene, zygotene, pachytene, diplotene and diakinesis stages. Crossing over is a physical exchange of equal pieces of adjacent non-sister chromatids. When crossing over occurs, chromatids break and may be reattached to a different homologous chromosome. Crossing over occurs during pachytene stage between non-sister chromatids of a pair of homologous chromosomes.
Thus, the correct answer is option B.
Question 2
1 / -0

Invisible stage of cell cycle is ________.

A
$$G_1$$ phase

B
S phase

C
$$G_2$$ phase

D
$$G_0$$ phase
Question 3
1 / -0

Pre-mitotic phase is ____.

A
$$G_0-phase$$

B
$$G_1-phase$$

C
$$S-phase$$

D
$$G_2-phase$$
Question 4
1 / -0

The chromosome of cell duplicates during the

A
S - phase of cell cycle

B
$$G_1$$ - phase of cell cycle

C
$$G_2$$ - phase of cell cycle

D
Prophase of cell division

Solution

S-phase (synthesis phase) is the part of the interphase of cell cycle occurring between $$G_1$$ and $$G_2$$-phase. This is the phase in which DNA replication takes place, i.e., chromosomes are replicated.
So, the correct answer is option A.
Question 5
1 / -0

Generation time represents period of

A
Cell cycle

B
Interphase

C
M-phase

D
S-phase

Solution

If we start with one cell, when it divides, there are 2 cells in the first generation, 4 cells in the second generation, 8 cells in the third generation, and so on. The generation time is the time interval required for the cells (or population) to divide. Eukaryote cells pass through a series of stages known collectively as the cell cycle: two gap phases (G1 and G2); an S (for synthesis) phase, in which the genetic material is duplicated; and an M phase, in which mitosis partitions the genetic material and the cell divides.
So, the correct option is 'A'.
Question 6
1 / -0

In which phase of the cell cycle are sister chromatids available as template for repair?

A
G$$_1$$ phase

B
G$$_2$$ phase

C
S Phase

D
M phase
Solution
- A DNA strand can be repaired by the process of homologous recombination. Sister chromatids are present on a homologous chromosome.
- In the G$$_2$$ phase, a broken sequence in a sister chromatid is repaired by the process of homologous recombination as the chromatids are available as a template in this phase.
  Thus the correct answer is option B.
Question 7
1 / -0

Centriole/centrosome replication occurs in

A
Early prophase

B
$$G_1$$-phase

C
S-phase

D
$$G_0$$-phase
Solution
- During $$G_1$$, a large amount of protein synthesis occurs, more organelles are produced and the volume of the cytoplasm increases.
- Also, certain intracellular components, such as the centrosomes undergo replication.
- It is an intermediate phase occupying the time between the end of cell division in mitosis and the beginning of DNA replication during the S phase.
  Thus, the correct answer is option B.
Question 8
1 / -0

At which phase of the cell cycle, DNA polymerase activity is at its highest?

A
Gap 1 (GI)

B
Mitotic (M)

C
Synthetic (S)

D
Gap 2 (G2)

Solution

The DNA replication takes place in the S phase of the cell cycle. The enzyme DNA polymerase is responsible for the addition of the new nucleotides against the template strand during the process if replication. This is the phase when the enzymatic activity is at the highest.
Thus, the correct answer is option C.
Question 9
1 / -0

Which one is stored in $$G_1$$ phase?

A
ATP

B
Tubulin

C
Histone

D
All the above

Solution

$$G_1$$ is an intermediate phase occupying the time between the end of cell division in mitosis and the beginning of DNA replication during S phase. $$G_1$$ phase specifically stores ATP and enzymes, while histone protein is synthesized in S phase and tubulin synthesis begins in $$G_2$$ phase.
So, the correct option is 'A'.
Question 10
1 / -0

During meiosis there is

A
One round of DNA replication and one division

B
Two rounds of DNA replication and one division

C
Two rounds of DNA replication and two divisions

D
One round of DNA replication and two divisions
Solution
Answer: (D) One round of DNA replication and two divisions.
Explanation:

Meiosis takes place in 2 stages- Meiosis 1 and Meiosis 2.
It consists of 1 round of DNA replication and two rounds of chromosomal segregation.
Meiosis 1 is the reductional division and meiosis 2 is equational division.
In meiosis 1 there is DNA replication followed by cell division and in meiosis 2 there is only cell division

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Cell Cycle and Cell Division Test - 44

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Cell Cycle and Cell Division Test - 44

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SHARING IS CARING

Question 1

Leptotene

Pachytene

Diplotene

Zygotene

Solution

Question 2

$$G_1$$ phase

S phase

$$G_2$$ phase

$$G_0$$ phase

Question 3

$$G_0-phase$$

$$G_1-phase$$

$$S-phase$$

$$G_2-phase$$

Question 4

S - phase of cell cycle

$$G_1$$ - phase of cell cycle

$$G_2$$ - phase of cell cycle

Prophase of cell division

Solution

Question 5

Cell cycle

Interphase

M-phase

S-phase

Solution

Question 6

G$$_1$$ phase

G$$_2$$ phase

S Phase

M phase

Solution

Question 7

Early prophase

$$G_1$$-phase

S-phase

$$G_0$$-phase

Solution

Question 8

Gap 1 (GI)

Mitotic (M)

Synthetic (S)

Gap 2 (G2)

Solution

Question 9

ATP

Tubulin

Histone

All the above

Solution

Question 10

One round of DNA replication and one division

Two rounds of DNA replication and one division

Two rounds of DNA replication and two divisions

One round of DNA replication and two divisions

Solution

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