Question

The correct sequence of adult cell cycle phases is

• A. S-M-G2-G1
• B. G1-G2-S-M
• C. G1-M-G2-S
• D. G1-S-G2-M

Hint:

Cell cycle order: G1 = Growth S = DNA synthesis G2 = Preparation M = Cell division

Answer 1

The Correct Option is D

Step 1: Outline the cell cycle.
The cell cycle has interphase (G1, S, G2) followed by the M phase of division.
Step 2: G1 phase.
G1 is the first growth phase where the cell grows and makes proteins, so the cycle starts here.
Step 3: S phase.
In the S (synthesis) phase DNA is replicated, so S follows G1.
Step 4: G2 phase.
G2 is the second growth phase preparing for division, so it follows S.
Step 5: M phase.
The M phase is the actual mitotic division, so it comes last.
Step 6: Conclude.
The order is G1 to S to G2 to M, which is option 4.
\[ \boxed{\text{G1-S-G2-M}} \]