Which type of medium support growth of mutant bacteria that are threonine auxotrophs?
A. Since threonine is essential for growth, threonine auxotrophs do not grow on any type of media.
B. Threonine auxotrophs only grow on media that lacks threonine.
C. Since threonine is essential for growth, threonine auxotrophs can grow on any type of media.
D. Threonine auxotrophs only grow on media that is supplemented with threonine.
Answer: D
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