-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.

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