Unicellular and Multicellular Organisms

Which best describes a difference between a unicellular organism and a multicellular organism?

• A unicellular organism is a plant and a multicellular organism is a human.
• A unicellular organism has one purpose- to survive.  A multicellular organism has many cells working together to keep the organism alive.
• A multicellular organism is simple and a unicellular organism is complex.
• A unicellular organism can only be found in certain biomes but a multicellular organism can be found anywhere on Earth.

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Which states a difference between an animal and an amoeba?

• An animal is made up of only one cell and an amoeba is made of many cells.
• An animal is found on land and an amoeba is found in water.
• An amoeba is single-celled and an animal is multicellular.
• An animal is a living organism and an amoeba is a non living organism

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Which is an example of a single-celled organism?

• bird
• cricket
• snake
• bacteria

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Which best explains how a single-celled organism can survive without other cells?

• They do not need any substance from outside of the cell.
• They are able to perform all necessary functions within one cell. 
• They do not need to perform more than one function to survive.
• They can't survive without other cells.

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

• reproduce
• specialize
• get rid of waste
• use energy

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Fish are multi-celled organisms with specialized cells. What would most likely happen if their specialized cells did not function properly?

• The fish would increase in size.
• The fish would decrease in size.
• The fish would die.
• The fish would grow and thrive.

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Bacteria often live inside the body of a living host, such as a dog. Which bestdescribes how bacteria carry out the processes necessary for survival?

• Bacteria borrow cells from the host to carry out life processes.
• Bacteria use their many different cells to carry out life processes.
• Bacteria are made up of one cell which is responsible for carrying out all life processes.
• Bacteria use their many different cells as well as cells from the host to carry out life processes.

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How are algae (a type of unicellular organism) able to survive?

• The algae get energy from other algae.

• The algae do not require energy to survive.

• The single cell controls all the algae’s life processes.

• Other multi-celled organisms provide food for the algae.

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Sue and Allie read about different kinds of organisms. They read about an organism with a respiratory system, digestive system, skeletal system, and muscular system. Which can Sue and Allie most likely conclude about this organism?

• The organism is unicellular.
• This organism is microscopic.
• The organism is multicellular.
• The organism does not have any cells.

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Which is an example of a multicellular organism?

• bacteria
• bear
• algae
• yeast

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