Biology Forums - Study Force

When glucose is present, the levels of cyclic AMP in the cell are low. What occurs in the lac operon of the cell as a consequence of high glucose?
(a)   When glucose is present, the cell will convert it to lactose and use that as the carbon source. 
(b)   When glucose is present, the levels of cyclic AMP are low. Therefore the lac operon genes are transcribed
(c)   When glucose is present, the levels of cAMP are low, CAP alone will not bind to the CAP binding site, and the structural genes are not transcribed. 
(d)   There is no effect


Which of the following function specifically in eukaryotic transcription and gene expression in eukaryotes?
(a) Enhances and restriction enzymes
(b)   Promoters and enhances
(c)   Pribnow boxes and enhancers
(d)   Shine-Dalgarno sequences and sigma factors
(e)   Origin DNA and promoters

11.Which of the following are common structural patterns (or motifs) for DNA-binding domains of proteins?
(a) Stem and loop, arginine zipper and lysine zipper
   (b) Cruciform, leucine zipper and zinc finger
(c)   D-loop, helix-turn-helix and leucine zipper
(d)   Helix-turn-helix, zinc finger and basic leucine zipper

1. When glucose is present, the levels of cAMP are low. CAP alone will not bind to the CAP binding site, and the structural genes are not transcribed.

2. promoters and enhancers

3. helix-turn-helix, zinc finger and basic leucine zipper

Enjoy :-X