Download Cell cycle

REPRODUCTION AND HEREDITY
1
Cell Cycle
1.
During the S stage of the cell cycle, the cell
a. undergoes cytokinesis
b. undergoes meiosis
b. undergoes mitosis
c. enters interphase
c. replicates its DNA
Short answer. Use the sketch below while answer the following questions.
1. Briefly describe the primary event happening in each of the four stages of the cell cycle.
2. What is the role of cyclin dependent kinase in moving between the 4 stages of the cell cycle?
3. Describe two "checkpoints" and why there existence is crucial to proper operation of the cell
cycle.
4. How does p21 block the transition from G1 to S?
5. Compare and contrast the roles of p53 and Rb protein in regulating the cell cycle.