Multiple Choice
Which of the following answers about His+ prototrophs and His- auxotrophs is incorrect?
16. Microbial Genetics
Prototrophs vs. Auxotrophs
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A mutant strain of bacteria requiring additional growth factors that is not seen in the wildtype strain is called:
A
An autotroph.
B
A heterotroph.
C
A prototroph.
D
An auxotroph.
E
A phototroph.
Verified step by step guidance1
Understand the definition of an auxotroph: An auxotroph is a mutant organism, typically a bacterium, that requires a particular additional nutrient that the wild-type strain does not need for growth.
Compare the definitions of the other terms: Autotrophs can synthesize their own food from inorganic substances, heterotrophs require organic compounds for nutrition, prototrophs are wild-type strains that do not require additional growth factors, and phototrophs obtain energy from light.
Identify the key characteristic of the mutant strain in the problem: It requires additional growth factors not needed by the wild-type strain.
Relate this characteristic to the definition of an auxotroph: The need for additional growth factors aligns with the definition of an auxotroph, which is a mutant strain requiring specific nutrients.
Conclude that the correct term for the mutant strain described in the problem is 'auxotroph', based on its requirement for additional growth factors.
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