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25 Cards in this Set
- Front
- Back
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What term refers to the billions of bacteria that live on your skin? |
normal flora
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What is the smallest, most basic unit of life? |
cell |
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What does "unicellular" mean? |
a single cell
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What does "multicellular" mean? |
many cells |
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In multicellular organisms, similar cells combine to form what structures? |
tissues |
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Various tissues combine to make up what structures? |
organs |
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Organs work together in and form what? |
organ systems |
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Various organ systems work together and form what? |
complex organisms |
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List, in order from small to large, the levels of biological organization. |
small molecules, large molecules, cells, tissues, organs, organ systems, complex organisms, populations, community, ecosystem, biosphere |
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What is the term that refers to the capacity to do work? |
energy |
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What is a term that describes all the chemical reactions that occur in a cell? |
metabolism |
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What is the ultimate source of energy for nearly all life on Earth? |
sun |
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The process of turning solar energy into chemical energy is known as what? |
photosynthesis
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Plants and animals get their energy by metabolizing nutrient molecules made by what type of organisms? |
photosynthesizers |
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What term is used to describe the maintenance of internal conditions within certain limits? |
homeostasis |
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What two ways do organisms use to maintain homeostasis? |
behavior and automatic control mechanisms
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The way an organism makes another organism like itself is referred to as what?
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reproduction |
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How do unicellular organisms reproduce? |
splitting in two |
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How do multicellular organisms reproduce? |
joining a sperm and egg |
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Long DNA molecules that carry genetic material are know as what? |
genes
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What provides the blueprint (or instructions) for the organization and metabolism of an organism? |
DNA |
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All cells in a multicellular organism contain the _____ set of genes. |
same |
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All cells in an organism contain the same set of genes. What makes cells different from each other? |
Only certain genes are "turned on" or activated |
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What are modifications that make organisms suited to their way of life referred to as? |
adaptations |
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List five features common to organisms. |
highly organized, acquire energy, respond to stimuli, reproduce, and adapt to their environment |
