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B
M pahse
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C
S phase
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D
G1 phase
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Solution
The correct option is A S phase
Interphase is the period between two subsequent M phases and consists of three phases: G1, S phase (the period of DNA replication) and G2 phase.
The G1 phase is the gap between M phase and S phase and is marked by synthesis of RNA and protein (excluding histones) and duplication of all cell content except DNA.
S phase of DNA replication and cell division is followed by G2 phase during which cell double-checks the duplicated DNA content.