Cell Review

Which example demonstrates that all cells come from pre-existing cells?

• A caterpillar feeds on the leaves from an oak tree.

• An oak tree grows from the seed material in an acorn.

• Moisture drips from underneath an oak tree leaf in the morning.

• Sediment from an area where oak trees were cut down builds up alongside a stream.

Which organelle is needed for plants to make energy?

• vacuole

• cytoplasm

• mitochondrion

• cell membrane

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Why is a cell membrane important to both plant and animal cells?

• It stores food and water.

• It controls the activities of the cell.

• It uses energy from the sun to perform photosynthesis.

• It provides a barrier between the cell and its environment.

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Which job is performed by the cell wall of a plant?

• maintaining shape and structure

• controlling functions

• breaking down materials

• passing on genetic material

Shayna placed a prepared slide of tissue from Zea mays, a corn leaf, under a microscope. She placed the slide on the stage and switched from low to high power. She used the adjustment knobs to focus the image. When she looked into the eyepiece, she observed many room-like structures. She made a sketch in her journal of her observations.

Which part of the cell theory does Shayna's sketch provide evidence for?

• All cells are invisible.

• All cells come from plant cells.

• All organisms come from seeds.

• All organisms are made of cells.

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A mushroom is an example of a multicellular organism called a fungus.

What are the basic units of life of this fungus and all other organisms?

• eggs

• molecules

• cells

• atoms

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How does a plant collect energy from light?

• with its cell wall

• with its cytoplasm

• with its chloroplast

• with its cell membrane

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Muscle cells in athletes often have more mitochondria than muscle cells in nonathletes. What can be inferred from this observation?

• Muscle cells in athletes reproduce less frequently than muscle cells of nonathletes.

• Muscle cells in athletes have a greater demand for energy than muscle cells of nonathletes.

• Muscle cells in athletes have a smaller supply of cell proteins than muscle cells of nonathletes.

• Muscle cells in athletes have nuclei containing more DNA than nuclei in muscle cells of nonathletes.

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Which process can Rylee learn about by studying the nucleus of a cell?

• how waste is removed

• how water is collected and stored

• how genetic information is passed on

• how energy is absorbed from sunlight

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Both the cell membrane and the cell wall act to protect the organelles within a cell. Which of the following best describes how the cell membrane is different from the cell wall?

• The cell membrane is made of a tough cellulose fiber, whereas the cell wall is made of a flexible glycogen fiber.

• The cell membrane only controls what crosses into the cell, whereas the cell wall only maintains a cell's rigidity.

• The cell membrane is a single-layered membrane, whereas the cell wall is a double-layered membrane.

• The cell wall is only found in plant cells, whereas the cell membrane is found in plant and animal cells.

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