MMSC 490 Questions FINAL Chp.17 with 100% correct Answers

MMSC 490 Questions FINAL Chp.17 with 100% correct Answers Damaged DNA is sensed by a complex of proteins that activate the protein kinase - Answer ️️ -ATM or ATR Fertilization of a frog egg triggers the resumption of meiosis by an increase in - Answer ️️ - Ca2+ The retinoblastoma protein (Rb) binds to and inhibits - Answer ️️ -Transcription factor E2F MPF is a general regulator of the transistion from - Answer ️️ -G2 to M At fertilization, the sperm binds to a receptor on the surface of the egg and fuses with the plasma membrane, initiating the development of a new diploid organism. Which of the following statements about fertilization is false? - Answer ️️ -the progression of metaphase to anaphase is triggered by the activation of MPF When a Xenopus oocyte is stimulated with the horomone progesterone, it enters meiosis and arrests at _____, awaiting fertilization by a sperm. - Answer ️️ -metaphase 2 The G2 checkpoint prevents entry into ____ if ______ - Answer ️️ -G2; DNA synthesis is not complete and/or DNA is damaged Cells are restricted to one round of DNA replication per cycle by origin of replication binding proteins called - Answer ️️ -MCMs Phosphorylation of the Golgi matrix proteins by Cdk1 during mitosis - Answer ️️ -mediates breakdown of the golgi apparatus into vesicles Studies on cell cycle mutants in budding and fission yeasts demonstrated that cdc2 and cdc28 both encode a - Answer ️️ -protein kinase the G1 checkpoint in budding yeast cells is called - Answer ️️ -START Growth factor stimulation of the Ras/Raf/ ERK pathway initially stimulates the synthesis of cyclin ___ - Answer ️️ -D Which of the following statements about cyclin B is false? - Answer ️️ -It cycles between active and inactive states in the cellcycle. Cell cycles of early embryonic animal cells are unusual because they have - Answer ️️ -no G1 or G2 In which of the following cell types do G1 and G2 not take place - Answer ️️ -early embryonic cells Which cyclin is/are required to pass the G1 restriction point in animal cells? - Answer ️️ - Cyclin D and Cyclin