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.

---

Definitions:

Simple Random Sampling

A sampling method where each member of the population has an equal chance of being selected.

Expected Forms

Standardized or anticipated documents, procedures, or formats within a system or process.

Common Tendencies

The usual or frequent patterns of behavior, thought, or feeling in a group or context.

Internet-based Research

Research conducted using the internet as a primary source of data collection or as the medium for conducting studies, including surveys and experiments.