Cell cycle, cancer, and mitosis

Interphase includes all of the following except

• synthesis of ATP
• synthesis of proteins
• attaching spindle fibers to the centromeres of chromosomes
• duplication of the cell's nucleus

If a drug interferes with the formation of spindle fibers, which stage of mitosis is most immediately effected?

• prophase
• metaphase
• anaphase
• telophase

The average life cycle of an onion cell is 13 hours. If 5 of 30 onion cells are undergoing mitosis,  approximately how many hours will the average onion cell spend in mitosis?

• 2 hours
• 4 hours
• 22 hours
• 78 hours

How does the concentration of cyclin dependent kinases (Cdk) change as the cell proceeds through the cell cycle?

• Cdk concentration remains constant.
• Cdk concentration increases during interphase and decreases during mitosis.
• Cdk concentration decreases during interphase and increases during mitosis.
• Cdk concentration correlates directly with MPF concentration.

Tags

NGSS.HS-LS1-4

Which of the following correctly describes cell that are in the G₀ phase?

• Mature nerve and muscle cells are unable to divide and are permanently in G₀.  
• Many cells enter G₀ when they reach the checkpoint during the M phase.
• Cells in G₀ are growing and preparing for cell division.
• DNA replication occurs during G₀.

The graph represents the amount of DNA in the nucleus of each cell during the cell cycle.
Which region represents the G2 phase?

• I
• II
• III
• IV

Tags

NGSS.HS-LS1-4

How does the concentration of cyclin change as a cell goes through the cell cycle?

• Cyclin concentration remains constant.
• Cyclin concentration increases during interphase and decreases during mitosis.
• Cyclin concentration decreases during interphase and increases during mitosis.
• Cyclin concentration is inversely related to MPF concentrations.

Tags

NGSS.HS-LS1-4

Once a cell completes mitosis, what happens to MPF? 

• It is completely degraded
• it is exported from the cell
• the cyclin component of MPF is degraded
• the Cdk component of MPF is degraded

Tags

NGSS.HS-LS1-4

The normal function of a tumor suppressor gene is 

• to produce growth signals
• to code for proteins that inhibit, or slow, cell division
• to cause the cell to move faster through the cell cycle
• to attack cancer cells in the body

In which stage of the cell cycle are cells most susceptible to mutations? 

• G1
• S
• G2
• G0