Question

Match List I with List II

	List I		List II
(a)	S Phase	(i)	Proteins are synthesized
(b)	G2 Phase	(ii)	Inactive phase
(c)	Quiescent stage	(iii)	Interval between mitosis and initiation of DNA replication
(d)	G1 Phase	(iv)	DNA replication

Choose the correct answer from the option given below.

• A. (a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)
• B. (a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
• C. (a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)
• D. (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)

Answer 1

The correct option is D (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)

G₁, S and G₂ phases are the sub-phases of interphase of the cell cycle.
The G₁ (gap 1) phase is the first phase of interphase which is the interval between mitosis and cell division. The cell remains metabolically active in this phase. It is followed by the S (synthesis) phase during which the cell makes an extra copy of DNA by replication. S phase is followed by G₂ (Gap 2) phase, proteins are synthesised in preparation for mitosis.
Some animal cell do not undergo further cell divisions. They exit the G₁ phase to enter an inactive stage called quiescent stage (G₀ phase) of the cell cycle. Cells in the quiescent stage remain metabolically active do not proliferate unless called on to do so depending on the requirement of the organism.