Cell Cycle And Cell Division Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following correctly describes cytokinesis in animal cells?

A cell plate forms
A cleavage furrow forms
Spindle fibers push daughter cells apart
Nuclear membrane dissolves
2

In animal cells, cytokinesis occurs through the formation of a cleavage furrow that pinches the cell into two daughter cells.

Which of the following statements about cytokinesis is correct?

Animal cells form a cleavage furrow
Plant cells divide by forming a cleavage furrow
Cytokinesis occurs before nuclear division
Cytokinesis does not occur in mitosis
1

Animal cells undergo cytokinesis through a cleavage furrow, while plant cells form a cell plate.

What is the significance of the centromere in mitosis?

It is the site where spindle fibers attach to chromosomes
It initiates DNA replication
It controls the progression of the cell cycle
It forms the nuclear membrane
1

The centromere is the region where spindle fibers attach during cell division to facilitate chromosome movement.

Which of the following occurs only in meiosis and not in mitosis?

Chromosome condensation
Spindle fiber formation
Pairing of homologous chromosomes
Nuclear membrane breakdown
3

Homologous chromosome pairing occurs only in meiosis during prophase I, leading to genetic recombination.

What happens during interkinesis?

DNA replication occurs
Chromosome number doubles
No DNA replication occurs
Homologous chromosomes pair up
3

Interkinesis is the resting phase between meiosis I and meiosis II, during which no DNA replication occurs.

Which of the following statements about genetic variation in meiosis is incorrect?

Crossing over occurs during prophase I
Independent assortment occurs during metaphase I
Meiosis results in genetically identical cells
Genetic recombination occurs during meiosis
3

Meiosis produces genetically varied cells due to crossing over and independent assortment, not identical ones.

What is the main event during anaphase of mitosis?

Chromosomes align at the equatorial plate
Nuclear membrane reappears
Sister chromatids separate and move to opposite poles
Chromosomes condense
3

During anaphase, the centromeres split, and sister chromatids are pulled to opposite poles by spindle fibers.

Which of the following statements about prophase is correct?

Spindle fibers disappear
Chromosomes condense and become visible
Nuclear envelope reforms
Chromosomes align at the metaphase plate
2

During prophase, chromatin condenses into visible chromosomes, and spindle fibers begin to form.

Which of the following statements about meiosis I and meiosis II is incorrect?

Meiosis I reduces the chromosome number by half
Meiosis II resembles mitosis
DNA replication occurs before both meiosis I and II
Meiosis results in four haploid cells
3

DNA replication occurs only before meiosis I, not between meiosis I and II.

Which checkpoint ensures that all chromosomes are properly attached to spindle fibers before progressing?

G1 checkpoint
G2 checkpoint
M checkpoint
S checkpoint
3

The M checkpoint ensures that all chromosomes are correctly attached to spindle fibers before progressing to anaphase.

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