STRUCTURE AND PROPERTIES OF PEPTIDES QUIZ

Hydrogen bonds in a-helices are

more numerous than Vander Waals interactions

roughly parallel to the helix axis

analogous to the steps in a spiral staircase

not present at Phe residues

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is an example of tertiary structure in a protein?

An a-helix

A P-pleated sheet

A globular domain

A multimeric protein

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the three subunits of the G proteins binds GDP and GTP?

Gamma

Alpha

Delta

Beta

TRUE ANSWER : ?
YOUR ANSWER : ?

The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?

C20H50O20N10

C20H40O10N10

C20H68O29N10

C20H32O11N10

TRUE ANSWER : ?
YOUR ANSWER : ?

The nature of peptide bond can be best explained as

truly double bond

partial double bond

Hydrogen bond

Van der waals force

TRUE ANSWER : ?
YOUR ANSWER : ?

The oxygen binding curves of hemoglobin and myoglobin

allow maximum transfer of oxygen to the tissues

both (a) and (b)

are identical

are a consequence of the quaternary structure of hemoglobin

TRUE ANSWER : ?
YOUR ANSWER : ?

The peptide bond in proteins is

usually trans unless proline is the next amino acid

is planar because of steric hinderance

only found between proline residues

usually cis unless proline is the next amino acid

TRUE ANSWER : ?
YOUR ANSWER : ?

The major element of secondary structure in myoglobin and hemoglobin is

the P-strand

the a-helix

All of these

the reverse turn

TRUE ANSWER : ?
YOUR ANSWER : ?

The oxygen in hemoglobin and myoglobin is bound to

the iron atom in the heme group

lysine residues in the protein

the nitrogen atoms on the heme

histidine residues in the protein

TRUE ANSWER : ?
YOUR ANSWER : ?

The heme is held in place by a bond between

the Fe2+ and cysteine

the Fe2+ and histidine

the Fe3+ and histidine

the Fe3+ and cysteine

TRUE ANSWER : ?
YOUR ANSWER : ?

↑