A cell is halted in the G1 phase of the cell cycle. Which best explains why the cell has not moved into the S phase?
A
The levels of mitotic cyclins are too low.B
The levels of mitotic cyclins are too low.C
The levels of mitotic cyclins are too high.D
The levels of mitotic cyclins are too high.E
The levels of G1 cyclins are too low.F
The levels of G1 cyclins are too low.G
The levels of G1 cyclins are too high.H
The levels of G1 cyclins are too high.