Cell CycleRegulation

In order to enter the cell cycle a cell must be stimulated from outside. What type of molecule provides this stimulation?

• Cyclins

• Cyclin-dependent kinases

• growth factors

• Polymerases

Programmed cell death is called

• apoptosis
• cytokinesis
• interphase
• cancer

Which is a disadvantage of asexual reproduction?

• It takes longer than sexual
• It is more complicated than sexual
• It produces no variety in offspring
• It cannot produce as many offspring as sexual

Tags

NGSS.MS-LS3-2

Which of these may be assessed by various proteins during a "checkpoint"?

• Ensure that all chromosomes have lined up in the center of the cell before sister chromatids separate
• Ensure that spindle fibers have attached to all  centromeres before cell division
• Ensure that DNA has been replicated properly
• All of these

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 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

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

Which of these is a risk factor for developing cancer? 

• growing older
• genetic inheritance
• exposure to carcinogens (toxins that can damage DNA)
• all of the above

Tags

NGSS.HS-LS3-2

Oncogenes

• are mutated forms of tumor suppressor genes
• are mutated genes that result in apoptosis
• are mutated genes the inhibit the cell cycle
• are mutated genes that code for proteins which activate cell division at the improper time

Tags

NGSS.HS-LS1-4