Indicate whether each of the following occurs mainly in G₁ phase (G), S phase (S), or G₂ phase (H) of the cell cycle. Your answer would be a four-letter string composed of letters G, S, and H only, e.g. HGSS.
( ) DNA helicase activation
( ) DNA helicase deposition on DNA at the replication origins
( ) ORC phosphorylation
( ) Licensing of replication origins

Question

Quizplus · Accepted Answer

The loading of inactive DNA helicases onto the replication origins and the formation of the prereplicative complex (preRC) occur in late mitosis and early G₁. In S phase, the helicases are activated to initiate DNA replication, while the origin is prevented from refiring by origin recognition complex (ORC) phosphorylation and other mechanisms.

Indicate Whether Each of the Following Occurs Mainly in G1

Indicate Whether Each of the Following Occurs Mainly in G₁