Tuesday, October 4, 2016

Cell Cycle Questions Online Test 5

Cell Cycle Questions Online Test 5
1. What causes the decrease in the amount of cyclin at a specific point in the cell cycle?
  • an increase in production once the restriction point is passed
  • the cascade of increased production once its protein is phosphorylated by Cdk
  • the changing ratio of cytoplasm to genome
  • its destruction by a process initiated by the activity of its complex with a cyclin


2. Which of the following is released by platelets in the vicinity of an injury?
  • PDGF
  • MPF
  • protein kinase
  • cyclin


3. Which is a general term for enzymes that activate or inactivate other proteins by phosphorylating them?
  • PDGF
  • MPF
  • protein kinase
  • cyclin


4. Fibroblasts have receptors for this substance on their plasma membranes:
  • PDGF
  • MPF
  • protein kinase
  • cyclin


5. Which of the following is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?
  • PDGF
  • MPF
  • protein kinase
  • cyclin


6. Which of the following is a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active?
  • MPF
  • protein kinase
  • cyclin
  • Cdk


7. Which of the following triggers the cellʹs passage past the G2 checkpoint into mitosis?
  • PDGF
  • MPF
  • protein kinase
  • cyclin


8. This is the shortest part of the cell cycle:
  • G1
  • S
  • G2
  • M


9. DNA is replicated at this time of the cell cycle:
  • G0
  • G1
  • S
  • G2


10. The ʺrestriction pointʺ occurs here:
  • G0
  • G1
  • S
  • G2

Cell Cycle Questions Online Test

Cell Cycle Questions Online Test =>

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