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Topic 2: Cells and Control
2.1 Mitosis and the Cell Cycle
2.1.1 Stages of the Cell Cycle
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DNA replication occurs during the
S phase
of interphase.
True
Why do chromosomes condense during prophase?
To prepare for division
What is the main characteristic of metaphase?
Chromosomes align at mid-plane
Why is chromosome condensation necessary during prophase?
To allow easy separation
During anaphase, the spindle fibers shorten, pulling the chromatids to the opposite
poles
What reforms around each set of chromosomes during telophase?
Nuclear envelope
Stages of interphase in the correct sequence
1️⃣ G1 (Gap 1)
2️⃣ S (Synthesis)
3️⃣ G2 (Gap 2)
Match the stage of interphase with its purpose:
G1 (Gap 1) ↔️ Growth and preparation for DNA replication
S (Synthesis) ↔️ DNA replication
G2 (Gap 2) ↔️ Final preparation for mitosis
What is the longest phase of the cell cycle?
Interphase
Arrange the key events of prophase in the correct sequence.
1️⃣ Chromosomes condense
2️⃣ Nuclear envelope breaks down
3️⃣ Mitotic spindle forms
4️⃣ Centrosomes move to opposite poles
What is the role of the mitotic spindle during prophase?
To prepare to pull chromosomes apart
DNA replication ensures each daughter cell receives a complete set of
DNA
What happens to sister chromatids during anaphase?
They separate and move apart
Chromosomes decondense into chromatin during
telophase
.
True
Interphase is the longest phase of the cell
cycle
The G2 phase ensures the cell is ready for
division
Centrosomes move to opposite
poles
during prophase.
Spindle fibers attach to the centromeres of
chromosomes
during metaphase.
The centromeres split, allowing the sister chromatids to
separate
during anaphase.
What is the purpose of chromosomes decondensing during telophase?
DNA becomes accessible
Arrange the stages of the cell cycle in the correct sequence.
1️⃣ Interphase (G1, S, G2)
2️⃣ Prophase
3️⃣ Metaphase
4️⃣ Anaphase
5️⃣ Telophase
6️⃣ Cytokinesis
What is checked during the G2 phase of interphase?
DNA errors
The nuclear envelope breaks down during prophase to allow interaction with the
mitotic spindle
.
True
Spindle fibers attach to the centromeres of chromosomes during
metaphase
.
True
Arrange the key events of metaphase in the correct sequence.
1️⃣ Chromosomes align at the cell's midplane
2️⃣ Spindle fibers attach to centromeres
3️⃣ The cell monitors correct attachment
What splits during anaphase to allow sister chromatids to separate?
Centromeres
Arrange the key events of telophase in the correct sequence.
1️⃣ Chromosomes decondense into chromatin
2️⃣ Nuclear envelope reforms
3️⃣ Spindle fibers disassemble
4️⃣ The cell prepares for cytokinesis
DNA replication occurs during the G1 phase of interphase.
False
What is the first stage of mitosis?
Prophase
Chromosomes align at the cell's midplane during metaphase.
True
Sister chromatids separate during
anaphase
.
True
Events of telophase in the correct sequence
1️⃣ Chromosomes decondense
2️⃣ Nuclear envelope reforms
3️⃣ Spindle fibers disassemble
4️⃣ Preparation for cytokinesis
What structure creates a new cell wall in plant cells during cytokinesis?
Cell plate
What is the role of the mitotic spindle in prophase?
Prepares to pull chromosomes apart
Why is correct attachment monitored during metaphase?
To prevent premature anaphase
What ensures each daughter cell receives a complete set of genetic material during anaphase?
Chromosomes move to opposite poles
Cytokinesis in animal cells involves the formation of a
furrow
.
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