Amino Acids,Peptides and Proteins MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Amino Acids,Peptides and Proteins, a fundamental topic in the field of Biochemistry. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Amino Acids,Peptides and Proteins MCQs are designed to help you grasp the core concepts and excel in solving problems.

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Amino Acids,Peptides and Proteins MCQs | Page 4 of 31

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Q31.
The peptide bond in proteins is

a.

planar, but rotates to three preferred dihedral angles

b.

nonpolar, but rotates to three preferred dihedral angles

c.

nonpolar, and fixed in a trans conformation

d.

planar, and usually found in a trans conformation

Discuss
Answer: (d).planar, and usually found in a trans conformation
Q32.
In ฮฒ-pleated sheet structures neighbouring

a.

chains lie in a flat plane

b.

neighboring residues are hydrogen bonded

c.

neighboring chains are connected by a-helices

d.

neighboring chains are hydrogen bonded

Discuss
Answer: (d).neighboring chains are hydrogen bonded
Q33.
The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin to produce

a.

Val-Lys + Glu-Met-Ser + Trp-Arg-Ala.

b.

Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.

c.

Val-Lys-Glu-Met-Ser + Trp-Arg-Ala.

d.

Val-Lys-Glu-Met + Ser-Trp-Arg-Ala.

Discuss
Answer: (b).Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.
Q34.
Unpaired H-bond donors and acceptors are found in the hydrophobic core of a protein

a.

only at the ends of a-helices

b.

only at the turns connecting p-strands

c.

only on Pro residues

d.

rarely

Discuss
Answer: (d).rarely
Q35.
For the unfolding reaction of Protein G, ฮ”H° =210.6 kJ/mol, this means that

a.

unfolding is favored enthalpically

b.

folding is favored enthalpically

c.

the entropy is positive at all temperatures

d.

the entropy is negative at all temperatures

Discuss
Answer: (b).folding is favored enthalpically
Q36.
Attractive Vander Waals forces occur between

a.

apolar molecules in the liquid state

b.

any pair of nearby atoms

c.

polar molecules in the solid state

d.

only if other forces are less favorable

Discuss
Answer: (b).any pair of nearby atoms
Q37.
Which of the following forces is the most favorable for protein folding?

a.

Conformational entropy

b.

Hydrophobic Interactions

c.

Vander Waals interactions

d.

Hydrogen bonds

Discuss
Answer: (b).Hydrophobic Interactions
Q38.
At the midpoint of a temperature transition curve,

a.

half of the protein is denatured

b.

Keq = 1.0 and ฮ”G = 0

c.

[Native] = [Unfolded]

d.

All of these

Discuss
Answer: (d).All of these
Q39.
Buried hydrophobic side chains in a globular protein fit into a hole formed by the side chains of

a.

1-3 other amino acids

b.

5-7 other amino acids

c.

9-12 other amino acids

d.

13-15 other amino acids

Discuss
Answer: (b).5-7 other amino acids
Q40.
Which of the following is the most correct?

a.

Charged amino acids are never buried in the interior of a protein

b.

Charged amino acids are seldom buried in the interior of a protein

c.

All hydrophobic amino acids are buried when a protein folds

d.

Tyrosine is only found in the interior of proteins

Discuss
Answer: (b).Charged amino acids are seldom buried in the interior of a protein
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