DNA, Cell Cycle, and Differentiation

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?

• Cell division is a completely random process

• Once cells divide, they can never divide again

• The controls on cell growth and division can be turned on and off

• There is only a limited amount of DNA available to a given group of cells

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Cancer is a disorder in which some cells have lost the ability to control their

• size

• spindle fibers

• growth rate

• surface area

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Cancer cells form masses of cells called

• tumors

• cyclins

• growth factors

• p53

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All of the following are problems that growth causes for cells EXCEPT

• more demands on DNA

• excess oxygen

• obtaining enough food/nutrients

• expelling wastes

Which diagram shows cancer cells?

• A

• B

One of the two identical strands of DNA that make up a duplicated chromosome

• sister chromatids

• daughter cells

• centromere

• stem cell

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Growth, development, and division

• cell cycle

• centromere

• interphase

• mitosis

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Structure that holds sister chromatids together

• daughter cells

• cytokinesis

• centromere

• sister chromatids

Division of a cell's cytoplasm and contents

• centromere

• mitosis

• chromatids

• cytokinesis

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Two new cells that result from mitosis and cytokinesis

• daughter cells

• mitosis

• sister chromatids

• cell cycle

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