Question

which of these must occur during s phase of the cell cycle so that two daughter cells can be produced during m phase? a the dna must be replicated. b the chromosomes must be joined. c the cytoplasm must be separated. d the cell membrane must be expanded.

Explanation:

The S - phase (synthesis phase) of the cell cycle is when DNA replication occurs. This is essential so that each daughter cell produced during mitosis (M - phase) will have a complete set of genetic material. Chromosome joining is not a main event in S - phase. Cytoplasm separation occurs during cytokinesis after M - phase. Cell membrane expansion is not the key event in S - phase for producing daughter cells.

Answer:

A. The DNA must be replicated.