Answer :

The cell ensures the supply of energy and nucleotides, and proteins, like histones and enzymes needed for DNA replication during the G1 phase.

Nucleotides are the basic units of DNA as well as RNA.  A nucleotide consists of a sugar, a phosphate group and a nitrogenous base. Several nucleotides joined together form a complete DNA.

G1 phase of the cell cycle belong to the interphase stage. During this the cell prepares for the further events like DNA replication and cell division. This is called the growth phase of cell where the cell becomes larger in size. It is also rich in several proteins, enzymes and other molecules that will be required during the upcoming events.

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