A) prototrophs
B) autotrophs
C) heterotrophs
D) auxotrophs
Correct Answer: D
Solution :
In bacteria mutation occurs which results in loss of the ability to synthesize an essential metabolite such as amino acid or growth factor. It will express itself in a nutritional requirement for that substrate such mutants are known as auxotrophs. An auxotroph may be derived from the wild type or from a mutant derivative of the wild type. The parent from which the auxotroph was derived is called as prototroph. A prototroph may or may not be the wild type. The organisms able to use \[C{{O}_{3}}\] as a sale source of carbon are called autotrophs. Heterotrophs (chemoorganotrophs) are organisms obtaining their energy from the oxidation of organic compound.
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