In Catabolite Repression Systems of Some Gram-Positive Bacteria,such as Bacillus

question 6

Multiple Choice

In catabolite repression systems of some Gram-positive bacteria,such as Bacillus subtilis,transcription of catabolic operons is regulated by CcpaA (catabolite control protein A) rather than cAMP.Propose a hypothesis to explain the preferential use of glucose in the presence of a second sugar such as sucrose by Bacillus subtilis.

• A)CcpaA acts as a repressor of sucrose operon genes in Bacillus subtilis when both sugars are present.
• B)CcpaA acts as an inducer of sucrose operon genes in Bacillus subtilis when both sugars are present.
• C)CcpaA acts as a repressor of sucrose operon genes in Bacillus subtilis when lactose,but not glucose,is present.
• D)CcpaA acts as an inducer of sucrose operon genes in Bacillus subtilis when glucose,but not lactose,is present.

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