AP Biology Cell Cycle and Regulation

Cells of organisms must go through cell division for?

• growth

• repair of damaged cells

• replacement of dying cells.

• All of these

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The cell cycle is regulated by this

• cyclins

• stem cells

• cyclin-dependent kinases

• both cyclins and cyclin-dependent kinases

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Cells replicate DNA.

• G1

• S

• G2

• M phase

Some scientists name the stage where cells carry out their normal functions but are unlikely to divide. The name they give this stage is _________.

• G0

• G1

• G2

• G3

What triggers the cell to move from G2 phase to mitosis?

• Completion of DNA replication

• Alignment of chromosomes at the cell's equator

• Separation of sister chromatids

• Formation of the spindle fibers

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What is the role of cyclins in cell cycle regulation?

• They degrade DNA

• They promote cell division

• They prevent cell division

• They have no role in cell cycle regulation

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• The cell cycle has built in checkpoints that monitor the cell cycle and can stop it if something goes wrong: 

  • near the end of the​ (a)   stage of ​interphase , a checkpoint monitors for DNA damage and can stop the cycle before entering the ​ (b)   stage of interphase

• G1

• S

• G2

Which of the following occurs during the G1 phase of Interphase?

• DNA replication

• Chromosome segregation

• Cell growth and normal functions

• Preparation for mitosis

• The timing and rate of cell division is controlled by a combination of two substances: 

• proteins called​ ​ (a)   bind to enzymes called ​ (b)   during interphase and mitosis

• cyclins

• cyclin-dependent kinases (CDKs)

• carcinogens

• centromeres

• spindle fibers

• aster fibers

• centrioles

• motor proteins

• microfilaments

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What is the significance of the G0 phase in the cell cycle?

• It is the phase where cells prepare for DNA replication.

• It is a resting phase where cells exit the cell cycle.

• It is the phase where cells divide.

• It is the phase where DNA is repaired.

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