In a Bacterium That Is Normally Cylindrical in Shape, Loss

question 64

Multiple Choice

In a bacterium that is normally cylindrical in shape, loss of either of two genes A and B results in round cells. Additionally, gain-of-function mutations in gene A can rescue the phenotype of gene B loss-of-function mutants. What phenomenon best describes this observation? The product of which gene is more likely to function upstream of the other one in determining cell shape in this bacterium?

• A) Suppression; gene A
• B) Suppression; gene B
• C) Complementation; gene A
• D) Complementation; gene B

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