Cell Biology Test

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Cell Biology Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

In which of the following stages of mitosis do chromosomes decondense and lose their individuality after having reached their respective poles?

A
Anaphase

B
Metaphase

C
Prophase

D
Telophase

Solution

This is the correct option. In telophase, chromosomes decondense and lose their individuality after having reached their respective poles.
The individual chromosomes can no longer be seen and chromatin material tends to collect in a mass in the two poles.
Question 2
1 / -0

In which of the following stages of mitosis does the centriole begin to move towards opposite poles of the cell?

A
Prophase

B
Metaphase

C
Telophase

D
Anaphase

Solution

In prophase, the centriole begins to move towards opposite poles of the cell.
Question 3
1 / -0

Which of the following features do(es) not belong to metaphase?

a. Spindle fibres attach to kinetochores of the chromosomes.
b. At the end of metaphase, the cells do not show golgi complexes, endoplasmic reticulum, nucleolus and the nuclear envelope.
c. Chromosomes are moved to spindle equator and get aligned along the metaphase plate.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

This is the correct option as this is not a feature of metaphase. At the end of prophase, the cells do not show golgi complexes, endoplasmic reticulum, nucleolus and the nuclear envelope.
Question 4
1 / -0

Telophase is the final stage of mitosis. Which of the following is/are not the characteristic(s) of telophase?

a. Golgi complex and ER reform.
b. Nuclear envelope assembles around the chromosome clusters.
c. Chromosomes cluster at opposite spindle poles.
d. Chromatids move to opposite poles.

A
Only a

B
Only a and b

C
Only b

D
Only d

Solution

This is the correct option as the movement of chromatids towards the opposite poles is not a characteristic of telophase.
Question 5
1 / -0

Which of the following statements about the significance of mitosis is false?

A
Multicellular organisms grow due to mitosis.

B
Mitosis contributes towards the repair of cells.

C
Mitosis increases the genetic variability in the population of organisms from one generation to the next.

D
The production of diploid daughter cells with identical genetic complement is a resultant of mitosis.

Solution

This is the correct option as this statement is false about the significance of mitosis. Meiosis increases the genetic variability in the population of organisms from one generation to the next.
Question 6
1 / -0

The kind of cell division that reduces the chromosome number by half and results in the production of haploid daughter cells is called meiosis. Which of the following is not a characteristic of meiosis?

A
At the end of meiosis 2, three haploid cells are formed.

B
It ensures the production of haploid phase in the life cycle of sexually reproducing organisms.

C
It involves 2 sequential cycles of nuclear and cell division.

D
Meiosis 1 is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase.

Solution

This is the correct option as this is not a characteristic of meiosis. At the end of meiosis 2, four haploid cells are formed.

Question 7

1 / -0

Match the following:

a. Leptotene stage	1. During this stage, chromosomes start pairing together and this process is called synapsis.
b. Zygotene stage	2. During this stage, under a light microscope, chromosomes become gradually visible.
c. Pachytene stage	3. During this stage, bivalent chromosomes clearly appear as tetrads.

a - 3, b - 1, c - 2

a - 2, b - 1, c - 3

a - 1, b - 2, c - 3

a - 1, b - 3, c - 2

Solution

This is the correct option. During leptotene stage, under a light microscope, chromosomes become gradually visible. During zygotene stage, chromosomes start pairing together and this process is called synapsis. During pachytene stage, bivalent chromosomes clearly appear as tetrads.

Question 8
1 / -0

Which of the following statements is/are false?

a. Prophase of the mitosis division is longer and more complex than the prophase of first meiotic division.
b. Mitosis accomplishes the segregation of duplicated chromosomes into daughter nuclei.
c. During cytoplasmic division, mitochondria and plastids get distributed between the two daughter cells.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

Prophase of the first meiotic division is longer and more complex than the prophase of mitosis.
Question 9
1 / -0

Chiasmata are x-shaped structures. Which of the following stages is marked by the terminalisation of chiasmata?

A
Pachytene

B
Zygotene

C
Leptotene

D
Diakinesis

Solution

Diakinesis is the final stage of meiotic prophase 1 and is marked by the terminalisation of chiasmata.

Question 10

1 / -0

Match the following:

a. Anaphase 2	1. In this stage, the chromosomes again become compact and by the end of this stage, the nuclear membrane disappears.
b. Metaphase 2	2. In this stage, the chromosomes align at the equator.
c. Prophase 2	3. This stage begins with the simultaneous splitting of the centromere of each chromosome.

a - 1, b - 2, c - 3

a - 1, b - 3, c - 2

a - 2, b - 3, c - 1

a - 3, b - 2, c - 1

Solution

This is the correct option. Anaphase 2 stage begins with the simultaneous splitting of the centromere of each chromosome. In metaphase 2, the chromosomes align at the equator. In prophase 2, the chromosomes again become compact and by the end of this stage, the nuclear membrane disappears.

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Cell Biology Test - 15

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Cell Biology Test - 15

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Question 1

Anaphase

Metaphase

Prophase

Telophase

Solution

Question 2

Prophase

Metaphase

Telophase

Anaphase

Solution

Question 3

Only a

Only a and b

Only b

Only b and c

Solution

Question 4

Only a

Only a and b

Only b

Only d

Solution

Question 5

Multicellular organisms grow due to mitosis.

Mitosis contributes towards the repair of cells.

Mitosis increases the genetic variability in the population of organisms from one generation to the next.

The production of diploid daughter cells with identical genetic complement is a resultant of mitosis.

Solution

Question 6

At the end of meiosis 2, three haploid cells are formed.

It ensures the production of haploid phase in the life cycle of sexually reproducing organisms.

It involves 2 sequential cycles of nuclear and cell division.

Meiosis 1 is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase.

Solution

Question 7

a - 3, b - 1, c - 2

a - 2, b - 1, c - 3

a - 1, b - 2, c - 3

a - 1, b - 3, c - 2

Solution

Question 8

Only a

Only a and b

Only b

Only b and c

Solution

Question 9

Pachytene

Zygotene

Leptotene

Diakinesis

Solution

Question 10

a - 1, b - 2, c - 3

a - 1, b - 3, c - 2

a - 2, b - 3, c - 1

a - 3, b - 2, c - 1

Solution

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