Cell Cycle And Cell Division Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

At which stage of mitosis do chromosomes align at the center of the cell?

Prophase
Metaphase
Anaphase
Telophase
2

During metaphase, chromosomes align at the metaphase plate, preparing for equal distribution to daughter cells.

Which of the following statements about telophase is correct?

Chromosomes condense
Nuclear membrane reforms
Chromosomes align at the metaphase plate
DNA replication occurs
2

During telophase, the nuclear membrane reforms around the separated chromosomes.

Which phase of meiosis is responsible for the formation of chiasmata?

Leptotene
Zygotene
Pachytene
Diplotene
4

During diplotene, homologous chromosomes begin to separate except at chiasmata, where crossing over has occurred.

What is the function of recombinase enzyme in meiosis?

DNA replication
Chromosome condensation
Crossing over during pachytene
Spindle formation
3

Recombinase is an enzyme that facilitates crossing over during the pachytene stage of prophase I in meiosis.

Which of the following statements about cell division checkpoints is correct?

G1 checkpoint ensures DNA has replicated correctly
M checkpoint ensures chromosomes are aligned properly
G2 checkpoint occurs before DNA replication
S checkpoint ensures cytokinesis occurs
2

The M checkpoint ensures that all chromosomes are properly aligned before proceeding to anaphase.

Which of the following statements about meiosis II is correct?

Meiosis II is identical to mitosis
Meiosis II reduces the chromosome number
DNA replication occurs before meiosis II
Meiosis II produces diploid daughter cells
1

Meiosis II is similar to mitosis, as it involves the separation of sister chromatids without further reduction in chromosome number.

Which structure disappears during prophase of mitosis?

Spindle fibers
Cell membrane
Nuclear envelope
Centromere
3

During prophase, the nuclear envelope disintegrates, allowing spindle fibers to attach to chromosomes.

What is the end result of meiosis in terms of chromosome number?

Diploid cells
Haploid cells
Polyploid cells
Tetraploid cells
2

Meiosis results in haploid cells, ensuring that gametes have half the chromosome number of the parent cell.

Which of the following is incorrect about prophase I of meiosis?

It is longer and more complex than prophase of mitosis
It includes five sub-stages
Crossing over occurs in zygotene
Homologous chromosomes pair up
3

Crossing over occurs in the pachytene stage, not in zygotene.

What is a key difference between meiosis I and meiosis II?

DNA replication occurs in meiosis I but not in meiosis II
Homologous chromosomes separate in meiosis II, not in meiosis I
Meiosis I produces haploid cells, while meiosis II produces diploid cells
Cytokinesis occurs only in meiosis I
1

DNA replication occurs only in meiosis I during the S phase, not in meiosis II, which is similar to mitosis.

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