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 14 of 31

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Q131.
In an SDS-PAGE

a.

proteins are denatured by the SDS

b.

proteins have the same charge-to-mass ratio

c.

smaller proteins migrate more rapidly through the gel

d.

all of the above

Discuss
Answer: (d).all of the above
Q132.
Proteins can be visualized directly in gels by

a.

staining them with the dye

b.

using electron microscope only

c.

measuring their molecular weight

d.

none of these

Discuss
Answer: (a).staining them with the dye
Q133.
In SDS-PAGE, the protein sample is first

a.

treated with a reducing agent and then with anionic detergent followed by fractionation by electrophoresis

b.

fractionated by electrophoresis then treated with an oxidizing agent followed by anionic detergent.

c.

treated with a oxidizing agent and then with anionic detergent followed by fractionation by electrophoresis

d.

none of the above

Discuss
Answer: (a).treated with a reducing agent and then with anionic detergent followed by fractionation by electrophoresis
Q134.
Electrophoresis of histones and myoglobin under non-denaturing conditions (pH = 7.0) results in

a.

both proteins migrate to the anode

b.

histones migrate to the anode and myoglobin migrates to the cathode

c.

histones migrate to the cathode and myoglobin migrates to the anode

d.

both proteins migrate to the cathode

Discuss
Answer: (c).histones migrate to the cathode and myoglobin migrates to the anode
Q135.
In isoelectric focusing, proteins are separated on the basis of their

a.

relative content of positively charged residue only

b.

relative content of negatively charged residue only

c.

size

d.

relative content of positively and negatively charged residue

Discuss
Answer: (d).relative content of positively and negatively charged residue
Q136.
In a gel filtration column

a.

smaller proteins enter the beads more readily

b.

large proteins elute first

c.

both (a) and (b)

d.

large proteins enter the beads more readily

Discuss
Answer: (c).both (a) and (b)
Q137.
In a native PAGE, proteins are separated on the basis of

a.

net negative charge

b.

net charge and size

c.

net positive charges size

d.

net positive charge

Discuss
Answer: (b).net charge and size
Q138.
The subunit molecular weight as well as the number of subunits in the quaternary structure can be determined by

a.

SDS-PAGE electrophoresis

b.

gel filtration chromatography

c.

combining information from (a)and (b)

d.

isoelectric focusing

Discuss
Answer: (c).combining information from (a)and (b)
Q139.
Proteins are separated in an SDS-PAGE experiment on the basis of their

a.

positively charged side chains

b.

molecular weight

c.

negatively charged side chains

d.

different isoelectric points

Discuss
Answer: (b).molecular weight
Q140.
An average polypeptide chain may contain up to

a.

300 amino acids

b.

400 amino acids

c.

500 amino acids

d.

more than 500 amino acids

Discuss
Answer: (c).500 amino acids
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