#Question id: 723
#Part-B Specialized Branches in Biotechnology
Common structural elements in proteins such as α-helices or β-sheets are characterized by uniformly repeating, energetically favorable main chain conformations which additionally exhibit a completely saturated hydrogen-bonding network of the main chain NH and CO groups. Although polyproline or polyglycine type II helices (PPII or PGII ) are frequently found in proteins, they are not considered as equivalent secondary structure elements. Which of the following statements are correct about PP and PGs.
A. PGII -like helices form hexagonal bundles which appear to fulfill the criterion of a (largely) saturated hydrogen-bonding network of the main-chain groups
B. main chain NH and CO groups of the central PGII -helix are saturated by either intra- or intermolecular hydrogen-bonds, resulting in a self-contained hydrogen-bonding network
C. The formation of the right-handed PPI helix is possible only with proline residues because of the required cis conformation.
D. PPII helices seem to be stabilized by main chain-water hydrogen bonds (in the absence of main chain- main chain H-bonds), and tend to have a regular pattern of hydrogen bonds with water. After this, it is not surprising, that PPII helices are found mostly on the protein surface.
#Question id: 10811
#Part-B Specialized Branches in Biotechnology
In mature cells, P-protein occurs in several different forms depending on the species. Such as;
#Question id: 3850
#Part-A Aptitude & General Biotechnology
The RNA molecule produced in RNA synthesis is:
#Question id: 2277
#Part-A Aptitude & General Biotechnology
A gram-positive bacterium is stained _______________ by the gram stain
#Question id: 14158
#Part-A Aptitude & General Biotechnology