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8 terms

-trophs in ch. 8

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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.