Cell Cycle And Cell Division
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which phase of the cell cycle is the longest in a typical eukaryotic cell?

M phase
G1 phase
S phase
Interphase
4

Interphase occupies more than 95% of the cell cycle and includes G1, S, and G2 phases.

What is the significance of meiosis in sexually reproducing organisms?

It reduces the chromosome number to half, ensuring genetic diversity
It produces identical cells for growth and repair
It increases the chromosome number
It only helps in asexual reproduction
1

Meiosis reduces the chromosome number by half and ensures genetic variation in sexually reproducing organisms.

Which of the following events occurs during prophase I of meiosis but not in prophase of mitosis?

Spindle fiber formation
Chromosome condensation
Crossing over
Nuclear membrane breakdown
3

Crossing over occurs during prophase I of meiosis, leading to genetic recombination, whereas it does not occur in mitosis.

Which of the following best describes the metaphase plate?

Site where chromosomes replicate
Region where spindle fibers are synthesized
Plane where chromosomes align during metaphase
Structure that holds sister chromatids together
3

During metaphase, chromosomes align at the metaphase plate, an imaginary plane equidistant from the spindle poles.

What happens during the diplotene stage of prophase I?

Synaptonemal complex dissolves
Crossing over occurs
Spindle fibers attach to kinetochores
Chromosomes align at the metaphase plate
1

During diplotene, homologous chromosomes start separating as the synaptonemal complex dissolves, but remain attached at chiasmata.

Which of the following is true about anaphase I of meiosis?

Sister chromatids separate
Homologous chromosomes move to opposite poles
Chromosomes align at the equator
Spindle fibers disappear
2

In anaphase I, homologous chromosomes (not sister chromatids) separate and move to opposite poles.

Which of the following statements about the cell cycle is incorrect?

Interphase is the longest phase of the cell cycle
M phase includes mitosis and cytokinesis
G1 phase occurs after the S phase
S phase is responsible for DNA replication
3

G1 phase occurs before the S phase, not after it.

Which of the following statements about interphase is incorrect?

Interphase consists of G1, S, and G2 phases
Interphase is the shortest phase of the cell cycle
DNA replication occurs in the S phase of interphase
Interphase prepares the cell for mitosis
2

Interphase is the longest phase of the cell cycle, not the shortest.

Which of the following is incorrect about the G1 phase?

The cell grows in size during G1 phase
Organelles are duplicated in G1 phase
DNA replication occurs in G1 phase
Cells prepare for DNA synthesis in G1 phase
3

DNA replication does not occur in G1 phase; it happens in the S phase.

Which of the following is correct about the M checkpoint?

It ensures that DNA replication is complete
It occurs at the end of G1 phase
It ensures that all chromosomes are attached to spindle fibers before anaphase
It prevents cytokinesis
3

The M checkpoint ensures that all chromosomes are properly attached to spindle fibers before anaphase begins.

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