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Multiple Choice
In the context of the cell cycle, the primary growth phase during which the cell increases in size and synthesizes proteins needed for DNA replication is ______.
A
M phase
B
G1 phase
C
G2 phase
D
S phase
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Verified step by step guidance
1
Understand the phases of the cell cycle: M phase (mitosis), G1 phase (first gap), S phase (synthesis), and G2 phase (second gap).
Recall that the G1 phase is the period after cell division (M phase) where the cell grows and produces proteins necessary for DNA replication.
Recognize that the S phase is when DNA replication actually occurs, so protein synthesis for replication must happen before this phase.
Note that the G2 phase is after DNA synthesis and involves preparation for mitosis, not the primary growth or protein synthesis for DNA replication.
Conclude that the primary growth phase with protein synthesis for DNA replication is the G1 phase.