5.3 Regulation of the Cell Cycle

Proteins that bind to cells and stimulate cell division are called

• enzymes.

• kinases

• growth factors.

• carcinogens.

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What is the term for the programmed death of cells?

• kinase

• cyclin

• carcinogen

• apoptosis

Two internal factors that are important in advancing the cell cycle are

• kinases and cyclins.

• hormones and enzymes.

• phosphates and enzymes.

• proteins and platelets

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Which phrase best describes cancer?

• absence of cyclins

• multiple gene mutations

• uncontrolled cell growth

• presence of genetic defects

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Substances known to produce or promote cancer are called

• carcinogens.

• kinases

• cyclins.

• malignancies.

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Extra Credit: How is a benign tumor different from a malignant tumor?

• Malignant tumors do not spread; cells in a benign tumor break away and spread to other parts of the body

• Benign tumors perform the specialized functions needed by the body; malignant tumors do not.

• Malignant tumors exert pressure on surrounding tissues; benign tumors do not.

• Benign tumors do not spread; cells in a malignant tumor break away and spread to other parts of the body.

True or false: internal and external factors work together to regulate the cell cycle.

• True

• False

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What happens to normal cells when they form a single layer?

• They keep dividing

• They stop dividing

• They yell at each other

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What happens in the G0 phase of the cell cycle?

• Cells replicate their DNA

• Cells go through mitosis

• Cells stop diving and are "resting"

Which type of cell would be most likely to re-enter the cell cycle from G0?

• Muscle

• Skin

• Liver

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