5. Genetics of Bacteria and Viruses
Working with Microorganisms
2:06 minutes
Problem 4a
Textbook Question
Textbook QuestionFifteen bacterial colonies growing on a complete medium are transferred to a minimal medium. Twelve of the colonies grow on minimal medium.
The serine biosynthetic pathway is a three-step pathway in which each step is catalyzed by the enzyme product of a different gene, identified as enzymes A, B, and C in the diagram below.
Mutant 1 grows only on In addition to growth on , mutant 2 also grows on and . Mutant 3 grows on and . Identify the step of the serine biosynthesis pathway at which each mutant is defective.
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