Normally, Neurospora Can Synthesize All 20 Amino Acids Specified by the Genetic

Normally, Neurospora can synthesize all 20 amino acids specified by the genetic code.A certain strain of this mold cannot grow in minimal nutritional medium but grows only when the amino acid leucine is added to the medium.This strain

A) is dependent on leucine for energy.
B) has a mutation affecting a biochemical pathway leading to synthesis of carbohydrates.
C) has a mutation affecting the biochemical pathways leading to synthesis of all 20 amino acids.
D) has a mutation affecting the biochemical pathway leading to synthesis of leucine.
E) has a mutation affecting the biochemical pathways leading to synthesis of 19 of the 20 amino acids.