IB Biology HL D2.1.15 Hl Cell Cycle Control By Cyclins Topic Practice

a. cell cycle is a sequence of stages / cell cycle is $\mathrm{G}_{1}, \mathrm{~S}, \mathrm{G}_{2}$ and mitosis
b. (control of the cell cycle) by cyclins/cyclin
c. levels of cyclins rise (and fall)/fluctuate during the cell cycle/surge at different times/have to reach a certain concentration
d. conditions inside as well as outside the cell affect regulation
e. four cyclins/different cyclins to enter different stages of/events in the cell cycle / cyclins regulate the sequence/timing of the cell cycle/cyclins trigger the next stages
f. cyclin-dependent kinases / cyclins bind to kinases and activate them
g. kinases phosphorylate other proteins
h. phosphorylated proteins perform specific functions in the cell cycle