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.

In this section, you'll find a wide range of Amino Acids,Peptides and Proteins mcq questions that explore various aspects of Amino Acids,Peptides and Proteins problems. Each MCQ is crafted to challenge your understanding of Amino Acids,Peptides and Proteins principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Biochemistry tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Amino Acids,Peptides and Proteins MCQs are your pathway to success in mastering this essential Biochemistry topic.

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

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Q31.
When pOโ‚‚ = Kd of myoglobin, the fractional saturation (YOโ‚‚) is about

a.

0.1

b.

0.5

c.

0.9

d.

1.7

Discuss
Answer: (b).0.5
Q32.
Peptides in the fully extended chain conformation

a.

have Y = F = 180°

b.

do not occur in nature

c.

also have a cis geometry in their peptide bonds

d.

are equivalent to the (3-sheet structure

Discuss
Answer: (a).have Y = F = 180°
Q33.
The oxygen in hemoglobin and myoglobin is bound to

a.

the iron atom in the heme group

b.

the nitrogen atoms on the heme

c.

histidine residues in the protein

d.

lysine residues in the protein

Discuss
Answer: (a).the iron atom in the heme group
Q34.
Which of the three subunits of the G proteins binds GDP and GTP?

a.

Alpha

b.

Beta

c.

Gamma

d.

Delta

Discuss
Answer: (a).Alpha
Q35.
In deoxy hemoglobin (Hb), the Fe (II) is coordinated to

a.

four nitrogens of heme, the proximal His, and a water molecule

b.

four nitrogens of heme and to a water molecule

c.

two nitrogens of heme and to three His residues in Hb

d.

two nitrogens of heme and to three water molecules

Discuss
Answer: (a).four nitrogens of heme, the proximal His, and a water molecule
Q36.
In the ฮฒ-pleated sheet

a.

hydrogen bonds are formed between the peptide bonds

b.

adjacent polypeptide chains can either be parallel or antiparallel

c.

the polypeptide chain is fully extended

d.

all of the above

Discuss
Answer: (d).all of the above
Q37.
The Ramachandran Plot illustrates the fact that

a.

the peptide bond is planar

b.

the F & Y angles can assume any value in a peptide

c.

the F & Y angles can assume only a single value in a protein

d.

the F & Y angles can assume approximately three different values

Discuss
Answer: (d).the F & Y angles can assume approximately three different values
Q38.
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

a.

is stronger than an ordinary single bond

b.

has partial double bond character

c.

both (a) and (b)

d.

is still not completely understood

Discuss
Answer: (c).both (a) and (b)
Q39.
The major element of secondary structure in myoglobin and hemoglobin is

a.

the P-strand

b.

the a-helix

c.

the reverse turn

d.

All of these

Discuss
Answer: (b).the a-helix
Q40.
Hydrogen bonds in a-helices are

a.

more numerous than Vander Waals interactions

b.

not present at Phe residues

c.

analogous to the steps in a spiral staircase

d.

roughly parallel to the helix axis

Discuss
Answer: (d).roughly parallel to the helix axis
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