Consider the Pathway for the Synthesis of the Amino Acid

question 50

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.The strains may carry more than one mutation.Growth is shown by (+) and no growth is shown by (o) . Strain a accumulates citrulline, strain b does not.Indicate the statement that is most correct regarding these two strains.

• A)Strain a has a mutation in ARG-E only.
• B)Strain b has only one mutation.
• C)Strain a has mutations in ARG-F and ARG-H.
• D)Strain a has mutations in ARG-E, ARG-F and ARG-H.
• E)Strain a has a mutation in ARG-H only.

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