Characteristics of Life and Viruses

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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Living things are based on a universal genetic

code. What molecule is responsible for that code?

• RNA

• Lipid

• Protein

• DNA

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For single-celled organisms, _____ is

mostly an increase in size.

Multicellular organisms go through a

process called __________, where cells

divide and differentiate into different

kinds of cells.

• Evolve, respond to stimulus

• Expansion, progress

• Growth, development

• Production, evolution

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The combination of chemical reactions through

which an organism builds up or breaks down

materials as it carries out its life processes is called ...

• absorption

• metabolism

• digestion

• consumption

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Maintaining a stable internal

environment is called

• homeostasis

• equilibrium

• balance

• evenness

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Identify the characteristic: Green plants produce their own food through the process of photosynthesis.

• All living things use energy

• All living things contain cells

• All living things maintain homeostasis

• All living things grow

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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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Fire is living because it has 6 of the 8 characteristics of life. 

• True 
• False