Questions and answers for exam Preparation

MCQs

Total Questions : 301 | Page 26 of 31 pages

Question 251. Which of the following is a 39-residue hormone of the anterior pituitary gland?

Corticotropin
Glucagon
Insulin
Bradykinin

Discuss Question

Answer: Option A. -> Corticotropin
Answer: (a).Corticotropin

Question 252. Which of the following statements is true about ion-exchange chromatography?

It separates proteins according to their size
The column matrix with bound anionic groups is called cationic exchanger
The column matrix with bound anionic groups is called anionic exchanger
The column matrix with bound cationic groups is called cationic exchanger

Discuss Question

Answer: Option B. -> The column matrix with bound anionic groups is called cationic exchanger
Answer: (b).The column matrix with bound anionic groups is called cationic exchanger

Question 253. Which of the following statements is true about SDS polyacrylamide chromatography?

SDS polyacrylamide gel electrophoresis separates proteins on the basis of size
SDS polyacrylamide gel electrophoresis separates proteins on the basis of charge
SDS binds to proteins non-covalently with a stoichiometry of around one SDS molecule per three amino acids
SDS binds to proteins non-covalently with a stoichiometry of around one SDS molecule per one amino acid

Discuss Question

Answer: Option B. -> SDS polyacrylamide gel electrophoresis separates proteins on the basis of charge
Answer: (b).SDS polyacrylamide gel electrophoresis separates proteins on the basis of charge

Question 254. Which of the following statements is false?

Primary structure of a protein determines how it folds up into a unique three dimensional structure
Secondary structure of a protein determines how it folds up into a unique three dimensional structure
Three dimensional structure of a protein determines the function of a protein
Amino acid sequence is absolutely invariant for a particular protein

Discuss Question

Answer: Option B. -> Secondary structure of a protein determines how it folds up into a unique three dimensional structure
Answer: (b).Secondary structure of a protein determines how it folds up into a unique three dimensional structure

Question 255. Which of the following statements is true about two-dimensional electrophoresis?

Separates proteins of identical molecular weight, same pI but different charge
Separates proteins of different molecular weight and different pI
Separates proteins of identical molecular weight that differ in pI
Isoelectric focusing is also termed as two-dimensional electrophoresis

Discuss Question

Answer: Option C. -> Separates proteins of identical molecular weight that differ in pI
Answer: (c).Separates proteins of identical molecular weight that differ in pI

Question 256. Which of the following statements is false?

The term activity refers to the total units of enzyme in a solution
The specific activity is a measure of enzyme purity
Specific activity increases during purification of an enzyme and becomes maximal and constant when the enzyme is pure
Specific activity decreases during purification of an enzyme and becomes maximal and constant when the enzyme is pure

Discuss Question

Answer: Option D. -> Specific activity decreases during purification of an enzyme and becomes maximal and constant when the enzyme is pure
Answer: (d).Specific activity decreases during purification of an enzyme and becomes maximal and constant when the enzyme is pure

Question 257. Native state of a protein can be disrupted by __________

Temperature
pH
Removal of water
Presence of hydrophilic surfaces

Discuss Question

Answer: Option D. -> Presence of hydrophilic surfaces
Answer: (d).Presence of hydrophilic surfaces

Question 258. Which of the following is true?

The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine stabilizes protein tertiary structure
The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine destabilizes protein tertiary structure
The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine stabilizes protein tertiary structure
The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine destabilizes protein tertiary structure

Discuss Question

Answer: Option C. -> The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine stabilizes protein tertiary structure
Answer: (c).The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine stabilizes protein tertiary structure

Question 259. Amino acids sequence in DNA can be determined by the order of their _________