MICR 3033 Test 3 Questions with complete solutions

10.1Q1 Define three stages of the cell cycle? Correct Answer-Interphase G0: where cells rest G1: where cells grow and expand S: where DNA is replicated G2: where cells repair damaged DNA and duplicate centrosomes Cell division (M) phase Where cells undergo nuclear and cytoplasmic division Each stage has checkpoints that check for completion and accuracy of previous step before starting the next one 10.2Q1 What are cyclin-dependent kinases (Cdks)? Correct Answer-Small family of protein kinases Once activated, regulate cellular processes active in each one of the cell cycle phases Kinase domain phosphorylates target proteins To activate, must associate with cyclins (regulatory subunits), as well as undergo multi-step activation involving two phosphorylations (by kinases) and one dephosphorylation (by phosphates) Cyclins: proteins that regulate the transition of a cell through the various phases of the cell cycle Fluctuate in concentration at singular stages of the cell cycle Degraded at specific times in the cell c