MMSC 490 practice quiz 10 chapter 17 with complete solutions

MMSC 490 practice quiz 10 chapter 17 with complete solutions Studies on cell cycle mutants in budding and fission yeasts demonstrated that cdc2 and cdc28 both encode a - Answer ️️ -protein kinase p21 inhibits cell cycle progression by binding to and inhibiting - Answer ️️ -cyclin-dependent kinases MPF is a general regulator of the transition from - Answer ️️ -g2 to M Fertilization of a frog egg triggers the resumption of meiosis by an increase in - Answer ️️ -Ca 2+ To prevent cells with unreplicated DNA from passing through thr G2 checkpoint, Chk1 and Chk2 _________ and _________ protein phosphatase Cdc25. - Answer ️️ -phosphorylate; stimulate The eukaryotic cell cycle is composed of four phases in the following order: - Answer ️️ -G1; S; G2; M The length of time it takes for the cells labeled during DNA synthesis to begin to enter mitosis is a good estimate of the length of the ___________ phase (s). - Answer ️️ -G1 and G2 Which of the following are not phosphorylated by the Cdk1/cyclin B complex during mitosis? - Answer ️️ -Histone H3 The progression from metaphase to anaphase is triggered by - Answer ️️ -ubiquitin-mediated proteolysis of key proteins When a Xenopus oocyte is stimulated with the hormone progesterone, it enters meiosis and arrests at ______, awaiting fertilization by a sperm. - Answer ️️ -metaphase II Chromosomes are attached to spindle microtubules by - Answer ️️ -kinetochores Polar microtubules - Answer ️️ -overlap in the center of the spindle In which of the following cell types do G1 and G2 not take place? - Answer ️️ -skin fibroblasts Cdks bind to cyclin and are activated by - Answer ️️ -dephosphorylation by CDc25 protein phosphate Phosphorylation of the golgi matrix proteins by Cdk1 during mitosis - Answer ️️ -mediates breakdown of the golgi apparatus into vesicles The diversity of haploid daughter cells is increased by the independent assortment of chromosomes at anaphase and by - Answer ️️ -crossing over and recombination MPF is a - Answer ️️ -dimer of Cdk1 and cyclin B Cells are restricted to one round of DNA replication per cycle by origin of replication binding proteins called - Answer ️️ -MCMs