BS 161 EXAM 3 NEWEST EXAM COMPLETE 300 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ Which major checkpoint delays the cell cycle when DNA replication is incomplete? 1) G1 checkpoint 2) M checkpoint 3) G2 checkpoint G1, G2, and M checkpoints 4) G2 checkpoint - ....ANSWER...G2 checkpoint CDKs are important in the regulation of the cell cycle. They carry out their function by: 1) degrading cyclin proteins 2) adding phosphate groups to proteins 3) preventing the progression of one stage of the cell cycle to the next 4)removing phosphate - ....ANSWER...Adding phosphate groups to proteins Which of the following is TRUE if a cell has a mutation in the p53 gene such that the p53 protein is no longer able to be phosphorylated? 1) The kinase activity in the nucleus would decrease 2) the cell would arrest 3) the cell would proceed through the cell cycle even in the presence of DNA damage 4) the amount of cytoplasmic p53 would increase - ....ANSWER...The cell would proceed through the cell cycle even in the presence of DNA damage Kinase - ....ANSWER ...an enzyme that catalyzes the transfer of a phosphate group from ATP to a specified molecule. CDK - ....ANSWER... cyclin dependent kinase S phase - ....ANSWER... The synthesis phase of the cell cycle; the portion of interphase during which DNA is replica ted. M phase checkpoint - ....ANSWER... chromosomes have attached to spindle apparatus, chromosomes have properly segregated and MPF is absent Cytokinesis - ....ANSWER... division of the cytoplasm to form two separate daughter cells G2 checkpoint - ....AN SWER... The cell checks to make sure the DNA is copied correctly G1 checkpoint - ....ANSWER... checks for cell size, nutrients, growth factors and DNA damage cell cycle - ....ANSWER... series of events that cells go through as they grow and divide G protein - ....ANSWER... A GTP -binding protein that relays signals from a plasma membrane signal receptor, known as a G protein -coupled receptor, to other signal transduction proteins inside the cell. Receptors - ....ANSWER... Special structures that allow living organisms to sense the conditions of their internal or external environment. How do new cyclin proteins appear in the cytoplasm? - ....ANSWER... They are made through protein synthesis. Which of the following is capable of phosphorylating key proteins involved in the regulation of the cell cycle? 1) CDK 2) p53 Protein 3) cyclin -CDK complex 4) cyclin 5) phosphatase - ....ANSWER...Cyclin -CDK complex Phosphatase - ....ANSWER... removes a phosphate group from a molecule Cyclin -CDK complexes - ....ANSW ER... phosphorylate other proteins to coordinate cell cycle progression; must be activated and inactivated at appropriate times for cell cycle to progress Cyclin - ....ANSWER... one of a family of closely related proteins that regulate the cell cycle in euk aryotic cells p53 protein - ....ANSWER... initiates transcription Cell division is regulated by?
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