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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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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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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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

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

• grasshopper

• bacteria

• pine needle

• mole

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.

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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Which organism performs all life processes in one cell?

• bacteria

• grass

• mushroom

• butterfly