Unicellular Organisms

Every plant and animal starts out as a single cell. This one cell divides and multiples to form a more complex multicellular organism.

• true
• false

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NGSS.MS-LS1-1

Which of the following is NOT a cell structure used for locomotion by unicellular organisms?

• cell wall
• pseudopod
• flagellum
• cilium

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

• They do not need to perform more than one function to survive.
• They are able to perform all necessary functions within one cell.
• They do not need any substance from outside of the cell.

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NGSS.MS-LS1-2

Which best describes a single-celled organism?

• a small group of organisms
• an organism that is able to carry out all its life processes
• a small organism with a variety of parts
• an organism that relies on other organisms to survive

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Logan is comparing the characteristics of different types of organisms. Which best describes a difference between insects and bacteria?

• Insects are made of one cell, while bacteria are made of many cells.
• Insects require energy to perform life functions while bacteria do not.
• Bacteria are made of one cell, while insects are made of many cells.
• Bacteria require energy to perform life functions while insects do not.

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NGSS.MS-LS1-1

Which is a characteristic of bacteria?

• large in size
• found only in one particular environment
• made up of many different cells working together
• able to survive as a single cell

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NGSS.MS-LS1-1

Which organism is best classified as a single-celled organism?

• grasshopper
• bacteria
• pine needle
• mole

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NGSS.MS-LS1-1

How do bacteria control their life processes?

• Bacteria control their life processes within multi-cells.
• Bacteria control their life processes within a single cell.
• Bacteria work with other cells to control all their life processes.

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NGSS.MS-LS1-1

NGSS.MS-LS1-2

How are multicellular and unicellular organisms different?

• Multicellular organisms have more than one cell and are smaller than unicellular organisms.
• Unicellular organisms have more than one cell and are larger than multicellular organisms.
• Unicellular organisms have one cell and are smaller than multicellular organisms.
• Multicellular organisms have one cell and are larger than unicellular organisms.

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NGSS.MS-LS1-1

Which organism performs all life processes in one cell?

• bacteria
• grass
• mushroom
• butterfly

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