Which of the following must occur during a typical eukaryotic cell cycle?

• A. Photosynthesis
• B. Chromosome segregation
• C. DNA replication
• D. Cell wall synthesis

Answer: (C)

Verified step by step guidance

1. Understand the context of the eukaryotic cell cycle: The eukaryotic cell cycle consists of several phases (G1, S, G2, and M) that ensure proper cell growth, DNA replication, and division. Key processes include DNA replication and chromosome segregation.
2. Eliminate irrelevant processes: Photosynthesis and cell wall synthesis are not universal to all eukaryotic cells. Photosynthesis occurs only in photosynthetic organisms (e.g., plants and algae), and cell wall synthesis is specific to certain organisms like plants and fungi.
3. Focus on DNA replication: During the S phase of the cell cycle, DNA replication occurs to ensure that each daughter cell receives an identical copy of the genome. This is a critical step in the cell cycle.
4. Focus on chromosome segregation: During the M phase (mitosis), chromosome segregation occurs. This ensures that each daughter cell receives the correct number of chromosomes, maintaining genetic stability.
5. Conclude that DNA replication and chromosome segregation are essential processes in a typical eukaryotic cell cycle, while photosynthesis and cell wall synthesis are not universally required.