Cell Cycle Quiz for Biology Class 10

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Which phase of the cell cycle is most significant for DNA replication?

G2 phase
M phase
G1 phase
S phase (correct)

The majority of the cell cycle is spent in the M phase.

False (B)

Who applied cell theory to explain the effects of diseases on tissues and organs?

Rudolf Virchow

The ______ phase is when the cell prepares for mitosis and ensures all conditions are met for division.

G2 Signup and view all the answers

Match the following phases of the cell cycle with their descriptions:

G1 = Interval before DNA replication S = DNA synthesis G2 = Preparation for mitosis M phase = Division of the nucleus Signup and view all the answers

What is the role of the centrosome during the S phase?

It duplicates to prepare for cell division. (B) Signup and view all the answers

Cytokinesis is the phase where the chromosomes are separated into daughter cells.

False (B) Signup and view all the answers

What happens during the G0 stage of the cell cycle?

Cells do not grow or divide. Signup and view all the answers

What happens during prometaphase?

The nuclear envelope breaks down. (C) Signup and view all the answers

Metaphase is the longest stage of mitosis.

False (B) Signup and view all the answers

What is the role of the kinetochore during cell division?

It serves as the attachment point for spindle fibers to pull chromatids apart. Signup and view all the answers

The __________ stage of mitosis involves the formation of the new nuclear envelope.

telophase Signup and view all the answers

Which of the following accurately describes cytokinesis in animal cells?

It occurs after anaphase, involving a cleavage furrow. (B) Signup and view all the answers

What does the mitotic index measure?

It measures the percentage of cells undergoing mitosis in a given population. Signup and view all the answers

Match the phase of mitosis with its description:

Prophase = Chromosomes condense and the mitotic spindle begins to form Anaphase = Sister chromatids are pulled apart towards opposite poles Cytokinesis = Division of the cytoplasm into two daughter cells Telophase = New nuclear envelopes form around the separated chromatids Signup and view all the answers

Sister chromatids are held together at the centromere by a protein complex called __________.

cohesion Signup and view all the answers

Interphase

The initial stage of the cell cycle, accounting for 90% of the cell cycle's duration.

G1 Phase

The first phase of interphase, where the cell grows and copies organelles, but DNA isn't replicated yet.

S Phase

Phase in interphase where DNA replication occurs, duplicating each chromosome to form sister chromatids.

M Phase

The phase of the cell cycle where mitosis (nuclear division) and cytokinesis (cytoplasm division) occurs.