Which of the following occurs during S phase?
a. Condensation of the chromosomes
b. Replication of the DNA
c. Separation of sister chromatids
d. Spindle formation

검증된 단계별 안내

Understand the cell cycle: The cell cycle consists of interphase (G1, S, G2 phases) and mitotic phase (M phase).

Identify the S phase: The S phase, or synthesis phase, is part of interphase where DNA replication occurs.

Review the options: (A) condensation of the chromosomes occurs during prophase of mitosis, (B) replication of the DNA occurs during the S phase, (C) separation of sister chromatids occurs during anaphase of mitosis, (D) spindle formation begins in prophase of mitosis.

Focus on DNA replication: During the S phase, each chromosome is duplicated, resulting in two sister chromatids for each chromosome.

Conclude the correct answer: Based on the understanding of the S phase, the correct answer is (B) replication of the DNA.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Cell Cycle

The cell cycle is a series of phases that cells go through to grow and divide. It consists of interphase (G1, S, and G2 phases) and mitotic phase (M phase). Understanding the cell cycle is crucial for identifying when DNA replication occurs, which is during the S phase of interphase.

S Phase

The S phase, or synthesis phase, is a part of interphase in the cell cycle where DNA replication occurs. During this phase, the cell duplicates its DNA, ensuring that each daughter cell receives an identical set of chromosomes. This is essential for maintaining genetic consistency across cell generations.

DNA Replication

DNA replication is the process by which a cell duplicates its DNA, producing two identical copies. This occurs during the S phase of the cell cycle and involves unwinding the double helix, using each strand as a template to synthesize new complementary strands, ensuring genetic information is accurately passed on.