Unit Test — Unit test Answers

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Which statement about the cell membrane is true?

It contains cellulose and sugars that are involved in communication.

It is present in animal cells only.

It is rigid and elastic for supporting the cell’s shape.

It prevents harmful substances from entering a cell.

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Consider this plant cell.Which organelle is labeled I?

nucleus

mitochondrion

ribosome

chloroplast

Gina is studying a cell under a powerful microscope. The cell does not contain membrane-bound organelles.Which cell is Gina most likely studying?

an animal cell

a bacterial cell

a plant cell

a protist cell

Which is a part of the cell theory?

cells come from pre-existing cells

cells have a nucleus

organisms with one cell must be seen with a microscope

organisms must have more than one cell to live

Which adaptation helps polar bears maintain a constant internal temperature (thermal homeostasis) in cold weather?

three layers of fur

blubber

finding shade underground

white skin

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