Question

Based on the figure below, a complete cell cycle consists of which of the following phases?

A) G1 → S → G2 → M
B) S → G2 → M → G1
C) G2 → M → G1 → S
D) G1 → S → G2 → M → C

Answer 1

A complete cell cycle consists of the phases G1 (growth), S (DNA synthesis), G2 (preparation for mitosis), followed by the M phase (mitosis and cytokinesis), making the correct sequence G1 → S → G2 → M → C.

Step-by-step explanation:

The complete cell cycle includes various phases through which a eukaryotic cell goes from one division to the next. The phases are organized into two main parts: interphase and the mitotic phase (M phase). Interphase itself consists of three stages: G1 (First Gap), S (Synthesis of DNA), and G2 (Second Gap). This is followed by the M phase, which includes mitosis and cytokinesis.

During the G1 phase, the cell grows and prepares for DNA synthesis. In the S phase, the DNA of the cell is replicated. The G2 phase is another period of growth and preparation for mitosis. Mitosis, or the M phase, is when the cell divides its nucleus and duplicated chromosomes. The final step in the cell cycle is cytokinesis, where the cytoplasm divides and two daughter cells are formed. Based on the information provided, the correct sequence for a complete cell cycle is G1 → S → G2 → M → C (mitosis followed by cytokinesis).