Cell Cycle Control

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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NGSS.HS-LS1-4

Cyclins are a family of closely related proteins that

• regulate the cell cycle

• produce p53

• cause cancer

• work to heal wounds

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NGSS.HS-LS1-4

Which of the following happens when a cell divides?

• The cell's volume increases

• It becomes more difficult for the cell to get rid of wastes

• Each daughter cell receives its own copy of the parent cell's DNA

• It becomes more difficult for the cell to get enough oxygen and nutrients

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NGSS.HS-LS1-4

The process by which a cell divides into two daughter cells is called

• Mitosis (cell division)

• metaphase

• interphase

• differentiation

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NGSS.HS-LS1-4

During which phase in the cell cycle does mitosis happen?

• G1 phase

• G2 phase

• M phase

• S phase

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NGSS.HS-LS1-4

When during the cell cycle is a cell's DNA replicated?

• G1 phase

• G2 phase

• S phase

• M phase

Which events occur during interphase?

• The cytoplasm divides

• The cell grows and prepares for mitosis

• The nucleus divides

• The cell grows and divides

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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NGSS.HS-LS1-4

When cells loses their ability to control cell division, it may lead to ______.

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NGSS.HS-LS1-4

______ are a group of related proteins that help regulate the cell cycle.