Florida Biology EOC Practice Test 2025 - Free Biology End-of-Course Practice Questions and Study Guide

Question: 1 / 400

During which phase of interphase is DNA copied?

G1 phase

G2 phase

Metaphase

S phase

During the S phase of interphase, DNA replication occurs. This is a crucial part of the cell cycle, as it ensures that each daughter cell will receive an identical copy of the organism's genetic material upon division. During the S phase, each chromosome is duplicated, resulting in two sister chromatids for each chromosome, which are later separated during mitosis.

The other phases listed do not involve DNA replication. In the G1 phase, the cell grows and carries out normal metabolic processes, preparing for DNA synthesis. The G2 phase follows DNA replication and involves further growth and preparation for cell division, including the synthesis of proteins necessary for mitosis. Metaphase, on the other hand, is a stage of mitosis itself, where the chromosomes line up at the cell's equator before being pulled apart to opposite poles. Thus, the correct phase for DNA copying is the S phase.

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