MICR 3033 Final Exam Questions with Complete Solutions

Define three stages of the cell cycle? Correct Answer-interphase: the cell grows and makes a copy of its DNA. m phase: the cell separates its DNA into two sets and divides its cytoplasm, forming two new cells cytokinesis: the cytoplasm of the cell is split in two, making two new cells and begins as mitosis ends. What happens during interphase? Correct Answer-The cell grows, copies its DNA, and prepares for cell division in three steps G1, S, G2. What are cyclin-dependent kinases (Cdks)? Correct Answer-Many of the kinases that drive the cell cycle are actually present at a constant concentration in the growing cell, but much of the time they are inactive form. To be active, such a kinase must be attached to a cyclin, a protein that gets its name from its cyclically fluctuating concentration in the cell and phosphorylate proteins. Because of this requirement, these kinases are called cyclin-dependent kinases, or Cdks. The activity of a Cdk rises and falls with changes in the concentration of its cyclin partner. What are cell cycle checkpoints? Correct Answer-a stage in the eukaryotic cell cycle at which the cell examines internal and external cues and "decides" whether or not to move forward with division. -G1 checkpoint at G1/S phase -G2 checkpoint at G2/M phase