A Levels Biology (9700)•9700/11/O/N/18

Explanation
Post-Cytokinesis Metabolic Activity Steps:
- Identify stage: Cell enters G1 phase after cytokinesis, focusing on growth and preparation for DNA synthesis.
- Recall key processes: Active metabolism supports biomass increase, including ATP production and macromolecule synthesis.
- Evaluate options: Processes 1 (e.g., glycolysis for energy) and 3 (e.g., protein synthesis for growth) surge; 2 (e.g., mitosis-related) declines.
- Select combination: Matches B as 1 and 3 align with interphase demands.
Not enough information: Processes 1, 2, and 3 are not defined in the question.
Why B is correct:
- G1 phase definition requires energy (process 1) and biosynthetic activity (process 3) for cell growth per cell cycle laws.
Why the others are wrong:
- A: Includes inactive process 2 post-division.
- C: Omits essential process 1 for ATP needs.
- D: Ignores process 1, insufficient for energy demands.
Final answer: B
Topic: Replication and division of nuclei and cells
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