Cell Cycle and Cell Division Test

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Cell Cycle and Cell Division Test - 20

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Question 1
1 / -0

The formation of sister chromatids takes place in which of the following phase?

A
G$$_{1}$$ phase

B
S phase

C
G$$_{2}$$ phase

D
M phase

Solution

Interphase is characterized is by three phases $$G_1$$ phase, S phase, and $$G_2$$ phase. It is the synthesis phase, during which DNA in each chromosome replicates producing the second chromatid. The two chromatids are known as sister chromatids.
So, the correct answer is option B.
Question 2
1 / -0

Which stages of cell division do the following figures A and B represent respectively?

A
Prophase and anaphase

B
Metaphase and telophase

C
Telophase and metaphase

D
Late anaphase and prophase

Solution

A typical mitotic division is carried out in following stages- prophase, metaphase, anaphase, and telophase. Late Anaphase is characterized by movement of chromosomes towards spindle poles. Prophase is the longest stage of mitosis and daughter centrioles begin to move away from each other.
So, the correct answer is option D.
Question 3
1 / -0

Which is not true for anaphase?

A
Golgi body and endoplasmic reticulum are reformed

B
Chromosomes move to opposite poles

C
Spindle poles move farther apart

D
Centromeres split and chromatids separate

Solution

In mitosis, anaphase is the stage of chromosome splitting at the centromere. Centromere divides and the two sister chromatids migrate towards opposite poles. The movement of chromatids is aided by spindle fibers. Golgi bodies and other cell organelles do not reappear in anaphase stage but reappear later on after cytokinesis.
So, the correct answer is option A.
Question 4
1 / -0

At metaphase, chromosomes are attached to the spindle fibres by their

A
Kinetochores

B
Centromere

C
Satellites

D
Secondary constrictions

Solution

Spindle fibers are the threadlike structure which is made up of microtubules. These originate from the centrioles during cell division and helps in the movement of chromosomes towards the pole. During metaphase, each chromosome gets attached to two spindle fibres, one from each pole, in the region of its kinetochores.
So, the correct answer is option A.
Question 5
1 / -0

In an organism, if the normal diploid number of chromosomes is 8, how many chromatids are present in each daughter cell at the end of meiosis I?

A
2

B
4

C
8

D
16

Solution

If the normal diploid number of chromosomes is eight. After meiosis I, each cell will have half the number of chromosomes, i.e., 4 chromosomes as meiosis I is reductional division. As each chromosome is comprised of two chromatids, the number of chromatids in each cell will be eight.
Question 6
1 / -0

Which is synthesized in G$$_{1}$$phase?

A
DNA polymerase

B
Histones

C
Nucleolar DNA

D
Myosin

Solution

G$$_1$$ phase or first growth phase is the longest phase of cell cycle. There is a synthesis of biochemicals like RNA, proteins, enzymes for DNA synthesis, amino acids for histone formation, nucleotides and ATP.
So, the correct answer is option A.
Question 7
1 / -0

A human T lymphocyte in the mitotic metaphase stage will contain how many DNA molecules (exclude the DNA of mitochondria)?

A
23

B
46

C
184

D
92

Solution

The human cell contains 46 chromosomes in which there are 22 pair of autosomes and one pair of sex chromosome. When the cell is in the mitotic stage of metaphase, there are chromosomes which are in the duplicated stage. So, there are 46 chromosomes and 92 DNA molecules.
Thus, the correct answer is option D.
Question 8
1 / -0

Chromosomes in metaphase get arranged at the equatorial plate (see Fig. 1). When these cells are treated with colchicine, cell division is arrested and the cells never enter anaphase. If we were to compare a colchicine treated cell at metaphase and an untreated cell in the same phase, we notice that chromosomes are more dispersed and do not arrange themselves on the equatorial plate in the treated cells (see Fig 2.).
Using this information, which of the following will be affected by colchicine?

A
Centromere

B
Spindle fiber

C
Centriole

D
Arms of chromosomes

Solution

A spindle poison is a poison that interrupts the cell division by affecting the spindles.axol. Colchicine is an alkaloid which inhibits the microtubule polymerization, organization, and orientation of spindle fibers which is essential to mitosis. Since there is no formation of spindle fibres, there will be no arrangement of the chromosomes.
Thus, the correct answer is option B.
Question 9
1 / -0

The gametes are formed in most of the multicellular organisms by a process of cell division called as

A
Mitosis

B
Replication

C
Meiosis

D
Prophage

Solution

Meiosis is a specialized type of cell division which reduces the chromosome number by half. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells with half the number of chromosomes as the original parent cell. Meiosis produces haploid gametes.
So, the correct answer is option C.
Question 10
1 / -0

Assertion : Primary spermatocytes are formed by meiosis-I in the spermatogonia.

Reason : Primary spermatocytes are formed by meiosis-I in the spermatogonia.

A
Both Assertion and Reason are true and Reason is a correct explanation of Assertion

B
Both Assertion and Reason are true but Reason is not a correct explanation of Assertion

C
Assertion is true but Reason is false

D
Both Assertion and Reason are false

E
Assertion is false but reason is true.

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Cell Cycle and Cell Division Test - 20

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Cell Cycle and Cell Division Test - 20

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SHARING IS CARING

Question 1

G$$_{1}$$ phase

S phase

G$$_{2}$$ phase

M phase

Solution

Question 2

Prophase and anaphase

Metaphase and telophase

Telophase and metaphase

Late anaphase and prophase

Solution

Question 3

Golgi body and endoplasmic reticulum are reformed

Chromosomes move to opposite poles

Spindle poles move farther apart

Centromeres split and chromatids separate

Solution

Question 4

Kinetochores

Centromere

Satellites

Secondary constrictions

Solution

Question 5

2

4

8

16

Solution

Question 6

DNA polymerase

Histones

Nucleolar DNA

Myosin

Solution

Question 7

23

46

184

92

Solution

Question 8

Centromere

Spindle fiber

Centriole

Arms of chromosomes

Solution

Question 9

Mitosis

Replication

Meiosis

Prophage

Solution

Question 10

Both Assertion and Reason are true and Reason is a correct explanation of Assertion

Both Assertion and Reason are true but Reason is not a correct explanation of Assertion

Assertion is true but Reason is false

Both Assertion and Reason are false

Assertion is false but reason is true.

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