What is the G1 phase (growth phase) best described as?

• A. It occurs after mitosis and before DNA replication.
• B. It is the phase where DNA is replicated.
• C. It is a phase of rapid cell death.
• D. It is the growth phase with more organelles and proteins.

Answer: (D)

G1 is the growth phase, where the cell increases in size and builds up its components. During this period, the cell makes more organelles, proteins, and other cellular machinery, and it stores energy so it’s ready to duplicate its DNA in the next phase. This preparation for DNA replication is what sets up the cell for the upcoming S phase, where DNA replication actually occurs. The idea that G1 involves rapid cell death isn’t accurate for normal cell cycling, and DNA replication happens in a subsequent phase, not during G1. So describing G1 as the growth phase with more organelles and proteins best captures its essential function.