What are the two major sources of energy for microbes?

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What are the two major sources of energy for microbes?

Microbes obtain energy in two broad ways: from light or from chemical compounds. In phototrophs, light energy is captured by pigments and converted into ATP and reducing power to drive carbon fixation and other processes. In chemotrophs, energy comes from the chemical bonds in reduced compounds—organic molecules by chemoorganotrophs or inorganic compounds by chemolithotrophs—through respiration that releases energy to make ATP. Water is not an energy source; it’s the medium for reactions. Oxygen acts as a common electron acceptor in aerobic respiration, not the energy source itself. Heat can affect reaction rates but is not a direct, universal energy source for microbial metabolism. So the two major energy sources are light and chemical compounds.

Microbes obtain energy in two broad ways: from light or from chemical compounds. In phototrophs, light energy is captured by pigments and converted into ATP and reducing power to drive carbon fixation and other processes. In chemotrophs, energy comes from the chemical bonds in reduced compounds—organic molecules by chemoorganotrophs or inorganic compounds by chemolithotrophs—through respiration that releases energy to make ATP. Water is not an energy source; it’s the medium for reactions. Oxygen acts as a common electron acceptor in aerobic respiration, not the energy source itself. Heat can affect reaction rates but is not a direct, universal energy source for microbial metabolism. So the two major energy sources are light and chemical compounds.

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