DNA replication occurs during

Answer: S phase S = "synthesis." Each chromosome duplicates into two sister chromatids.

The cell cycle consists of

Answer: Interphase (G₁, S, G₂) followed by mitotic phase (mitosis + cytokinesis) Interphase: G₁ (growth), S (DNA replication), G₂ (more growth / prep). M phase: mitosis + cytokinesis.

DNA replication occurs during which phase?

Answer: S phase The S (synthesis) phase of interphase is when chromosomal DNA is replicated, producing sister chromatids attached at the centromere.

AP Biology · Topic 4.6

Cell Cycle Practice

Part of Cell Communication and Cell Cycle.(IST-1.A)

Practice questions

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Sample questions

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Sample 1difficulty 1/5
$DNA replication occurs during$
- A
  $G₁ phase$
- B
  $G₂ phase$
- C
  $M phase$
- D
  $S phase$
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Why
$S = "synthesis." Each chromosome duplicates into two sister chromatids.$
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Sample 2difficulty 1/5
$The cell cycle consists of$
- A
  $Interphase (G₁, S, G₂) followed by mitotic phase (mitosis + cytokinesis)$
  check_circle
- B
  $Mitotic phase (prophase, metaphase, anaphase) followed by interphase (G₀ + cytokinesis)$
- C
  $Resting phase (G₀, G₁, G₂) followed by synthesis phase (S phase + chromosome pairing)$
- D
  $Replication phase (S, G₁, G₂) followed by division phase (meiosis I + meiosis II)$
Why
$Interphase: G₁ (growth), S (DNA replication), G₂ (more growth / prep). M phase: mitosis + cytokinesis.$
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Sample 3difficulty 1/5
$DNA replication occurs during which phase?$
- A
  $G1 phase$
- B
  $S phase$
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- C
  $M phase$
- D
  $G2 phase$
Why
$The S (synthesis) phase of interphase is when chromosomal DNA is replicated, producing sister chromatids attached at the centromere.$
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Sample 4difficulty 1/5
$Mitosis produces$
- A
  $Four genetically diverse haploid daughter cells$
- B
  $Two genetically identical diploid daughter cells$
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- C
  $Two genetically distinct haploid daughter cells$
- D
  $One polyploid cell with duplicated chromosomes$
Why
$Mitosis: 1 diploid \to 2 diploid genetically identical daughter cells.$
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Sample 5difficulty 1/5
$The biological significance of mitosis includes$
- A
  $Growth, repair, and asexual reproduction (in some organisms)$
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- B
  $Producing genetic diversity through recombination$
- C
  $Generating haploid gametes for sexual reproduction$
- D
  $Halving chromosome number to form gametes$
Why
$Mitosis maintains chromosome number across cell generations, enabling growth and tissue repair (and asexual reproduction in some species).$
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