Question

Arrange the following cell cycle stages in the correct order of their occurrence:
A. S phase
B. M phase
C. G1 phase
D. G2 phase

• A. D, B, C, A
• B. A, C, B, D
• C. C, A, D, B
• D. B, C, D, A

Hint:

A simple mnemonic to remember the order of the cell cycle is "Go Sally Go! Make Children!". \textbf{G}o → \textbf{G1} \textbf{S}ally → \textbf{S} phase \textbf{G}o → \textbf{G2} \textbf{M}ake \textbf{C}hildren → \textbf{M} phase (\textbf{C}ytokinesis)

Answer 1

The Correct Option is C

Step 1: Cell Cycle Overview:
The cell cycle is a sequence of ordered events resulting in cell division and the creation of two daughter cells. It's primarily divided into Interphase (cell growth and DNA replication) and the Mitotic (M) phase (cell division).

Step 2: Phase Breakdown:
Interphase consists of three sub-phases in a specific order:
1. G1 phase (Gap 1): The initial phase post-division. The cell increases in size and produces proteins and mRNA needed for DNA synthesis. Corresponds to letter C.
2. S phase (Synthesis): Occurs after G1. DNA replication is the key event. Corresponds to letter A.
3. G2 phase (Gap 2): Follows DNA replication. The cell continues growth and synthesizes proteins required for mitosis, preparing for cell division. Corresponds to letter D.
After Interphase (G1, S, and G2), the cell proceeds to:
4. M phase (Mitosis): Involves chromosome separation (mitosis) and cytoplasm division (cytokinesis), creating two identical daughter cells. Corresponds to letter B.

Step 3: Solution:
The correct cell cycle sequence is G1 \(\rightarrow\) S \(\rightarrow\) G2 \(\rightarrow\) M.
Based on the provided letters, the order is C \(\rightarrow\) A \(\rightarrow\) D \(\rightarrow\) B.
This sequence corresponds to option (C).