Consider the Pathway for the Synthesis of the Amino Acid

question 53

Multiple Choice

Consider the pathway for the synthesis of the amino acid arginine in Neurospora: Mutant strains of Neurospora are grown in minimal media supplements as follows.Strains may carry more than one mutation.Growth is shown by (+) and no growth is shown by (o) . Indicate the most accurate statement regarding strain A.

• A) There is a mutation in ARG-H, if citrulline accumulates, ARG-F is also defective.
• B) There is a mutation in ARG-H, if ornithine accumulates, ARG-F is also defective.
• C) There is a mutation in ARG-H, if argininosuccinate accumulates, ARG-F is also defective.
• D) There is a mutation in ARG-H, if citrulline accumulates, ARG-E is also defective.
• E) There is a mutation in ARG-E, if citrulline accumulates, ARG-F is also defective.

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