-trophs in ch. 8
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8 terms
Terms | Definitions |
|---|---|
 phototrophs | photosynthetic organisms that use light as their energy source |
| chemotrophs | use organic compounds, such as glucose, or inorganic substances such as iron, nitrate, ammonia, or sulfur, as sources of energy |
| autotrophs | able to carry out carbon fixation |
| heterotrophs | cannot fix carbon; they use organic molecules produced by other organisms as the building blocks from which they synthesize the carbon compounds they need. |
| photoautotrophs | use light energy to make ATP and other molecules that temporarily hold chemical energy but are unstable and cannot be stockpiled in the cell. |
| photoheterotrophs | able to use light energy but unable to carry out carbon fixation. must obtain carbon from organic compounds |
| chemoautotrophs | prokaryotes obtain their energy from the oxidation of reduced inorganic molecules such as hydrogen, sulfide, or ammonia. |
| chemoheterotrophs | use preformed organic molecules as a source of both energy and carbon. |
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