Which phase is responsible for DNA replication?

Which phase is responsible for DNA replication?

• A. G2 phase
• B. G1 phase
• C. S phase
• D. Mitotic phase

Answer: (C)

The S phase, or synthesis phase, is responsible for DNA replication during the cell cycle. In this phase, the cell duplicates its genetic material to ensure that each daughter cell will have a complete set of chromosomes after cell division. The S phase follows the G1 phase, where the cell grows and prepares for DNA synthesis, and precedes the G2 phase, where the cell continues to grow and prepares for mitosis. During the S phase, the DNA strands are unwound and each strand serves as a template for the synthesis of a new complementary strand. This process ensures that the genetic material is accurately duplicated, allowing for the proper distribution of chromosomes during cell division. Following the S phase, the cell proceeds to the G2 phase, where it prepares for mitosis, and finally enters the mitotic phase to physically divide the contents of the cell. Understanding the specific role of the S phase is crucial when studying cell division and the regulation of the cell cycle, particularly in the context of cancer, where the control of DNA replication can be disrupted.

The S phase, or synthesis phase, is responsible for DNA replication during the cell cycle. In this phase, the cell duplicates its genetic material to ensure that each daughter cell will have a complete set of chromosomes after cell division. The S phase follows the G1 phase, where the cell grows and prepares for DNA synthesis, and precedes the G2 phase, where the cell continues to grow and prepares for mitosis.

During the S phase, the DNA strands are unwound and each strand serves as a template for the synthesis of a new complementary strand. This process ensures that the genetic material is accurately duplicated, allowing for the proper distribution of chromosomes during cell division. Following the S phase, the cell proceeds to the G2 phase, where it prepares for mitosis, and finally enters the mitotic phase to physically divide the contents of the cell.

Understanding the specific role of the S phase is crucial when studying cell division and the regulation of the cell cycle, particularly in the context of cancer, where the control of DNA replication can be disrupted.