Organelles and Cell Theory

According to the cell theory:

• all cells must be studied with a microscope

• cells are filled with cytoplasm

• cells are controlled by the nucleus

• cells are the structural unit of living things

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Robert Hooke was the first person to observe the units that make up all living things. He saw little boxes that he called:

• cells

• genes

• nuclei

• chromosomes

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What is the outer boundary in all cells that controls what enters and leaves the cell?

• cell wall

• cell membrane

• nucleus

• endoplasmic reticulum

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What do all living things have in common?

• They are all made of cells

• They all have cell walls

• They all move the same way

• They all reproduce the same way

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A rejected hypothesis means that the data:

• did not support the evidence

• were not presented clearly

• did not support the hypothesis

• was not tested with enough variables

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Scientists observed mysterious flashing lights in the night sky and later discovered they were caused by a rare lightning storm. What aspect of the nature of science does this show?

• Science is a social activity.

• Scientific knowledge is durable.

• Science uses logic and imagination.

• The natural world is understandable.

Ms. Fish added new plants to her fish tank. A week later, many new snails appeared in the tank. She knows that snails come from egg masses that cling to plants. This proves what part of cell theory?

• All living things are made of cells.

• Cells are the basic unit of structure and function.

• Cells only come from pre-existing cells.

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The large, orange organelle in the center of this animal cell is the:

• cytoplasm

• nucleus

• cell membrane

• cell wall

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Which gives plant cells their strong, rigid structure?

• cell wall

• mitochondrion

• endoplasmic reticulum

• chloroplast

Which of these cells most likely came from a plant?

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