_______ gain energy from inorganic minerals such as nitrates, hydrogen sulfide, iron, and sulfur. a. chemotrophic autotrophic bacteria b. phototrophic autotrophic bacteria c. chemotrophic heterotrophic bacteria d. phototrophic heterotrophic bacteria

Biology · High School · Wed Jan 13 2021

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Correct answer is a. 

Chemosynthetic autotroph bacteria oxidise various inorganic substances and use the released energy for their ATP production. Chemosynthetic bacteria, unlike plants, obtain their energy from the oxidation of inorganic molecules, rather than photosynthesis. Chemosynthetic bacteria use inorganic molecules, such as ammonia, molecular hydrogen, sulfur, hydrogen sulfide and ferrous iron, to produce the organic compounds needed for their subsistence. Thiobacillus, Nitrobacter, and Nitrosomonas are examples of chemosynthetic bacteria.

So, the correct option is 'Chemosynthetic autotroph bacteria'.