Cell Theory and Characteristics of Life

What is the most basic unit of life?

• cell
• tissue
• organ
• organ system

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A _____ is something in the environment that causes an organism to respond.

• stimulus
• response
• cause
• effect

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When a baby kitten becomes an adult cat, this is an example of...

• energy metabolism
• growth and development
• response to stimuli
• having cells

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Maintaining a stable internal

environment is called

• homeostasis

• equilibrium

• balance

• evenness

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Identify the characteristic: A camel has eyelashes that work to keep the dust and sand out of its eyes.

• All living things adapt/respond to their environment

• All living things grow

• All living things have cells

• All living things use energy

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The dismissal bell rings and you pack up your belongings. In this scenario, what is the stimulus?

• The bell ringing
• You packing up your belongings
• More information is needed

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Multicellular means

• made of many cells
• made of one kind of cell
• made of only one cell

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Which of the following is NOT a characteristic shared by all living organisms?

• Ability to move
• Ability to grow and develop
• Made up of one or more cells
• Responds to stimuli

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Organisms, such as bacteria, are ______________ which means they consist of only a single cell.

• unicellular
• multicellular
• autotrophic
• heterotrophic

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An Amoeba is a unicellular, animal-like protist that lives in ponds and streams. According to cell theory, where did this cell come from?

• another pre-existing amoeba cell.
• energy from sun that allowed the protist to reproduce.
• a multicellular organism.
• the nonliving environment.

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