Single-Celled Organisms

When a thin slice from an onion is viewed through a microscope, lots of little box-like shapes are seen. These shapes are most likely

• atoms

• dust

• cells

• bubbles

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Which of these is a structure that is present in all organisms?

• a tissue

• a cell

• a stomach

• a brain

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A unicellular organism is BEST described as being

• a complex organism

• a microorganism

• an organism with specialized cells

• an organism with different types of tissue

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A single-celled organism can do everything a cell from a multicellular organism can do except

• specialize

• reproduce

• use energy

• make protein

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Which of the following must get nutrients from a transport system?

• amoeba

• euglena

• skin cell

• bacterial cell

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Which cell can survive without the help of other cells?

• leaf cell

• yeast cell

• onion cell

• muscle cell

Which BEST describes ALL unicellular organisms

• every cell is round

• Every cell can make food

• Every cell can move on its own

• Every cell performs all life functions

A class is modeling the differences between a unicellular organism and a multicellular organism. Which example is a model of a unicellular organism?

• a student passing out water to a group of people

• a student getting cereal from the cabinet

• two students collecting trash from a group

• four students working together to move a desk

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Why do multicellular organisms need transport systems?

• Most have cells that are not able to exchange gases with the outside environment

• Most have cells that are unable to grow and survive in their environment

• Most have cells that need food from sources outside their environment

• Most have cells that require more energy to survive than signle-celled organisms

A scientist is trying to decide whether an organism is unicellular or multicellular. Which information would help the scientist most to make her decision?

• size of the cells of the organisms

• what the organism eats

• how many types of cells are in the organism

• how fast the organism grows

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