Arabinose is a monosaccharide that E. coli can use as an energy source. When bot

Question

Arabinose is a monosaccharide that E. coli can use as an energy source. When both glucose and arabinose are present in the media,

A) arabinose binds the repressor, inactivating it, and cAMP levels are high so CAP binds to the DNA and transcription begins.

B) arabinose binds the repressor, inactivating it, but cAMP levels are low so CAP will not bind to the DNA and transcription does not begin.

C) arabinose binds the repressor and activates it and cAMP levels are low so CAP will not bind to the DNA and transcription does not begin.

Explanation / Answer

When both glucose and arabinose is present in media then glucose and arabinose both are in high concentration. As glucose level is high cAMP level becomes low so cAMP can't bind with cap protein and CAP will not bind with DNA and DNA transcription doesn't begin. But arabinose bind with repressor and inactivates it. So option B will bethe correct answer

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