In eukaryotic cells, the timing of the cell cycle is regulated by…
a)centrioles
b)cyclins
c)spindle fibers
d)the nuclear envelope

B)Cyclins regulate the timing of cell cycle

B

Explanation:In eukaryotic cells, the timing of the cell cycle is regulated by cyclins. They are a family of proteins that control the progression of cells through the cell cycle by activating cyclin-dependent kinase (Cdk) enzymes

answer; (phospholipid);

b

explanation: