The Proteins structure mcqs

1.The primary structure is primaily maintained by

a.peptide bond
b.hydrogen bond
c.lonic bond
d.hydrophobic bonds

2.which of the following statements are true regarding primary structure of proteins

a.primary structure denote the number of amino acids in a protein
b.primary structure denote the sequence of amino acids in a protein
c.primary structure determines the biological activity of a protein
d.all of these

3.which of the following amino acid is a alpha helix erminator

a.cysteine
b.alanine
c.proline
d.isoleucine

4.the secondary structure is primarily maintaned by

a.van der waals force
b.hydrogen bond
c.lonic bond
d.hydrophobic bonds

5.which of the following is the most common and stable conformation for a polypeptide chian

a.alpha helix
b.beta pleated sheets
c.antiparallel beta pleated sheet
d.tertiary structure

6.the amyloid protein deposition associated with alzheimer,s disease is composed of

a.alpha helix
b.beta pleated sheets
c.beta bends
d.tertiary structure

7.in alpha helix ,the bonding is between the

a.adjecent amino acids
b.carbonyl oxygen of one peptide bond to the NH group of the 4th amino acid away
c.carbonyl oxygen of second peptide bond to the NH group of the 3rd amino acid away
d.carbonyl oxygen of second peptide bond to the NH froup of the 5th amino acid away

8.which of the following statments are true regarding tertiary structure of proteins

a.3 dimensional structure of a protein
b.it is the biologically active conformation
c.primary structure of protein determines the tertiary structure
d.all of these

  1. The most common amino acid in beta bend is

a.cysteine
b.glycine
c.serine
d.methionine

10.which of the following statements are true regarding quaternary structure of proteins

a.refers to organisation and spatial arrangements of amino acids within a plypeptide chain
b.refers to organisation and spatial arrangements of proteins with many polypeptide chains
c. both a and b
d.none of these