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Is it possible for an organism to survive with only one cell?

• no, because organisms need many cells to be able to perform functions for life

• yes, as long as the organisms can perform all functions needed for life in that one cell

• no, because organisms cannot complete all necessary functions for life in such a small space

• yes, as long as the organism has multiple specialized parts with each performing a specific function

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Which best describes how single-celled and multicellular organisms are similar?

• Both require energy to survive.

• Both require fresh water to survive.

• Both require direct sunlight to survive.

• Both rely on many other cells to survive.

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An amoeba is a single-celled organism. Which best describes the amoeba?

• It has many cells that function as a simple system.

• It has many cells that function as a complex system.

• It has one cell that can carry out everything it needs to survive.

• It has one cell that needs other cells to help it survive and thrive.

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Which best describes a difference between single-celled organisms and multicellular organisms?

• Single-celled organisms are simple, while multicellular organisms are complex.

• Single-celled organisms have many functions, while multicellular organisms have one function.

• Single-celled organisms can live without water, while multicellular organisms cannot live without water.

• Single-celled organisms can only be found in one specific environment, while multicellular organisms can be found anywhere on Earth.

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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Why do humans require many different types of cells to survive?

• Human cells are identical and work together to perform the same function.

• Human cells are specialized and work together to perform the same function.

• Human cells are identical and work independently to perform different functions.

• Human cells are specialized and work independently to perform different functions.

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Mr. Erickson is teaching his students about cells. He provides the following description of an organism to the students.

This organism is small in size. It is very simple, and unlike many larger organisms, it does not function as a series of specialized systems.

Which best describes this organism?

• It completes all life functions with no cells.

• It completes all life functions with one cell.

• It completes all life functions with two cells.

• It completes all life functions with many cells.

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Which is an activity that a single-celled organism cannot perform?

• eating

• walking

• reproducing

• removing waste

Which is the best way to classify grasshoppers?

• Grasshoppers are multi-celled organisms because they are made up of one cell that carries out all of their life processes.

• Grasshoppers are single-celled organisms because they are made up of one cell that carries out all of their life processes.

• Grasshoppers are single-celled organisms because they are made up of many cells that carry out all of their life processes.

• Grasshoppers are multi-celled organisms because they are made up of many cells that carry out all of their life processes.

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

• size of the cells of the organism

• what the organism eats

• how many types of cells are in the organism

• how fast the organism grows

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