For Each of the Following Sentences, Fill in the Blanks

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below.Not all words or phrases will be used; each word or phrase should be used only once.
$\begin{array}{lll}\text { able } & \text { hexokinase } & \text { short } \\\text { asynchronously } & \text { inhibitory } & \text { sperm } \\\mathrm{Cdk} & \text { long } & \text { steady } \\\text { conserved } & \mathrm{M} & \text { stimulatory } \\\text { cyclin } & \text { maturation promoting factor } & \text { substrate } \\\text { divergent } & \text { oscillate } & \text { synchronously } \\\text { egg } & \text { PI 3-kinase } & \text { ubiquitin } \\\text { fibroblast } & \text { regulin } & \text { unable } \\\mathrm{G}_{1} & \mathrm{~S} & \text { uniform } \\\mathrm{G}_{2} & &\end{array}$

Many features of __________ cells make them suitable for biochemical studies of the cell-cycle control system.For example, the cells are unusually large and are arrested in a __________-like phase.When the cells are triggered to resume cycling, the cell divisions have especially __________ G₁ and G₂ phases and occur __________.Studies with Xenopus eggs identified a partly purified activity called __________ that drives a resting Xenopus oocyte into M phase.MPF activity was found to __________ during the cell cycle, although the amount of its kinase component, called __________, remained constant.The regulatory component of MPF, called __________, has a __________ effect on MPF activity and plays a part in regulating interactions with its __________s.The components of MPF are evolutionarily __________ from yeast to humans, so that the corresponding human genes are __________ to function in yeast.