BIOLOGY
PROTEINS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Adjacent amino acids
|
|
|
Carbonyl oxygen of one peptide bond to the NH group of the 4th amino acid away
|
|
|
Carbonyl oxygen of second peptide bond to the NH group of the 3rd amino acid away
|
|
|
Carbonyl oxygen of second peptide bond to the NH group of the 5th amino acid away
|
Detailed explanation-1: -The alpha helix structure takes advantage of the hydrogen bond between CO and NH groups of the main chain to stabilize. The CO group of each amino acid forms a hydrogen bond with the NH group of amino acid four residues earlier in the sequence.
Detailed explanation-2: -Peptide bonds are amide bonds between the -carboxyl group of one amino acid and the -amino group of another (Fig. 3-1).
Detailed explanation-3: -Peptide Bonds in alpha-Helices Point in the Same Direction In an -helix, hydrogen bonds can form between amino acids in one turn of the helix and amino acids in the succeeding turn.
Detailed explanation-4: -Hydrogen Bonds A single polypeptide chain may contain multiple alpha-helix and beta-pleated sheet regions. Each alpha-helix is stabilized by hydrogen bonding between the amine and carbonyl groups on the same polypeptide chain.
Detailed explanation-5: -The complete structure of a protein can be described at four different levels of complexity: primary, secondary, tertiary, and quaternary structure.