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 5 of 31

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Q41.
The best way to determine the location of protein in the purification scheme is to measure the

a.

rate of ATP synthesis

b.

changes in the refractive index

c.

UV absorption

d.

mass spectroscopy of the protein

Discuss
Answer: (a).rate of ATP synthesis
Q42.
The conformational changes from the T to the R state is initiated by

a.

binding of oxygen to the heme

b.

movement of the proximal histidine towards the heme

c.

movement of the F-helix, which contains the proximal His

d.

reorganization of protein-protein contacts between the individual subunits

Discuss
Answer: (a).binding of oxygen to the heme
Q43.
An allosteric activator

a.

increases the binding affinity

b.

decreases the binding affinity

c.

stabilizes the R state of the protein

d.

both (a) and (c)

Discuss
Answer: (d).both (a) and (c)
Q44.
Bisphosphoglycerate (BPG) cannot bind to the oxygenated R state of hemoglobin because

a.

it is displaced from the heme by oxygen

b.

it is displaced from the heme by movement of the proximal histidine

c.

its binding pocket becomes too small to accommodate BPG

d.

BPG binds to the R state with the same affinity as the T state

Discuss
Answer: (c).its binding pocket becomes too small to accommodate BPG
Q45.
The Hill coefficient (nH) for myoglobin and hemoglobin are respectively

a.

2.8 and 1.0

b.

1.0 and 2.8

c.

1.2 and 4.5

d.

4.5 and 1.2

Discuss
Answer: (b).1.0 and 2.8
Q46.
When protein binds two ligands in a non-cooperative manner, then the x-intercept of the Scatchard Plot is

a.

1

b.

2

c.

not defined

d.

none of the above

Discuss
Answer: (b).2
Q47.
O₂ binding to hemoglobin results in

a.

100-fold higher affinity for the last O₂ bound than for the first

b.

extensive protein conformational change

c.

both (a) and (b)

d.

100-fold lower affinity for the last O₂ bound than for the first

Discuss
Answer: (c).both (a) and (b)
Q48.
In hemoglobin, allosteric effects occur

a.

only in humans

b.

for maintaining Fe in the Fe2+ state

c.

to minimize oxygen delivery to the tissues

d.

to maximize oxygen delivery to the tissues

Discuss
Answer: (d).to maximize oxygen delivery to the tissues
Q49.
A protein that binds two ligands in a non-cooperative manner will show

a.

a sigmodial binding curve

b.

a hyperbolic binding curve

c.

a linear Scatchard Plot

d.

both (b) and (c)

Discuss
Answer: (d).both (b) and (c)
Q50.
Small molecules affect hemoglobin (Hb) by

a.

decreasing Hb affinity for O₂

b.

increasing [H+]

c.

increasing Hb affinity for O₂

d.

increasing [H+] and decreasing Hb affinity for O₂

Discuss
Answer: (d).increasing [H+] and decreasing Hb affinity for O₂
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