Question 10
Select the correct statement about $G_{1}$ phase
(a) cell is metabolically inactive
(b) DNA in the cell does not replicate
(c) it is not a phase of synthesis of macromolecules
(d) cell stops growing

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Solution

Option (b) DNA in the cell does not replicate

$G_{1}$ phase means gap 1 phase. It is the interval between mitosis and initiation of DNA replication. The cell is metabolically active and continuously grows but does not replicate the DNA content. The cell also synthesizes proteins that are required for DNA replication.
Rest of the options are not characteristics of $G_{1}$ phase.

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(A)	Second gap phase	-	Cytoplasmic growth continues
(B)	First gap phase	-	Initiation of replication
(C)	Interphase	-	Phase of preparation for cell division
(D)	DNA synthesis phase	-	Doubling of number of chromosome in cell

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