Biology Test Unit 7: Cell Structure and Function

In many cells, the structure that controls the cell's activities is the

• cell membrane

• organelle

• nucleolus

• nucleus

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Despite differences in size and shape, at some point all cells have DNA and a

• cell wall

• cell membrane

• mitochondria

• nucleus

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What distinguishes a eukaryotic cell from a prokaryotic cell is the presence of

• cell wall

• a nucleus

• DNA

• ribosomes

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In eukaryotic cells, chromosomes carrying genetic information are found in the

• ribosomes

• lysosomes

• nucleus

• cell membrane

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The organelles that break down lipids, carbohydrates, and proteins into small molecules that can be used by the cell are called

• vacuoles

• lysosomes

• ribosomes

• microfilaments

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Cell membranes consist mainly of

• lipid bilayers

• protein pumps

• carbohydrates

• proteins

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The movement of water molecules across a selectively permeable membrane is known as

• exocytosis

• phagocytosis

• endocytosis

• osmosis

A substance that moves by passive transport tends to move

• away from the area of equilibrium

• away from the area where it is less concentrated

• away from the area where it is more concentrated

• toward the area where is is more concentrated

Which of the following is trued of ALL single-celled organisms?

• They are all prokaryotes.

• They are all bacteria.

• They all reproduce.

• They all have a nucleus.

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A tissue is composed of a group of

• similar cells

• related organelles

• organ systems

• related organs

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