BIOCHEM QA IJNIP

B

Which of the following amino acids is/are nonpolar?

A) Tyrosine

B) Tryptophan

C) Lysine

D) A and B

E) B and C

C

What is the distinguishable group or moiety found in

arginine’s R group?

A) Indole

B) Imidazole

C) Guanidine

D) Thioether

E) ThiolT

B

Which test detects the presence of aromatic amino

acids?

A) Ninhydrin Test

B) Xanthoproteic Test

C) Sakaguchi Test

D) Millon-Nasse Test

E) Biuret Test

D

Which stabilizes the helical or sheet-like shape of a

peptide?

A) ionic interactions

B) peptide bonds

C) disulfide bonds

D) hydrogen bonds

D

Process of converting a peptide chain into free

amino acids

A) Melting

B) Denaturation

C) Splicing

D) Hydrolysis

B

The protein portion of an enzyme is called

A) Prosthetic group

B) Apoenzyme

C) Holoenzyme

D) Zymogen

E) Cofactor

D

Together with Mn2+, this vitamin is needed by the

enzyme acetyl CoA carboxylase, which catalyzes the

carboxylation of acetyl CoA to malonyl CoA

A) Vitamin B1

B) Vitamin B6

C) Vitamin C

D) Vitamin B7

C

Vitamin B3 deficiency

A) Beri-beri

B) Cheilosis

C) Pellagra

D) Burning feet syndrome

E) Peripheral neuropathy

C

What is the primary EC number of the enzyme serum

glutamate pyruvate transaminase?

A) 3

B) 1

C) 2

D) 5

D

The enzyme that combines acetyl-CoA and carbon

dioxide into a longer malonyl-CoA should have an EC

number of?

A) 1.1.1.2

B) 3.2.1.2

C) 4.6.1.2

D) 6.4.1.2

B

The higher the Km of a substrate, the ________ is

its affinity to an enzyme

A) higher

B) lower

C) n/a; Km is irrelevant to affinity

C

The Lineweaver-Burke plot below is typical for a

substrate with what type of inhibitor?

A) Competitive

B) Noncompetitive

C) Uncompetitive

B

Which of the following is incorrect?

A) Ribose is an aldopentose

B) Fructose is a ketopentose

C) Glucose is an aldohexose

D) Galactose is an aldohexose

A

Sucrose is a disaccharide consisting of

A) Glucose and fructose

B) Glucose and glucose

C) Glucose and galactose

D) Glucose and ribose

B

D-glucose and D-mannose is a pair of

A) Enantiomers

B) Epimers

C) Functional

D) Diastereomers

A

The correct name for the following sugar

A) 𝛼-D-glucopyranose

B) 𝛽-D-glucopyranose

C) 𝛼-D-fructofuranose

D) 𝛽-D-fructofuranose

A

Oxidation of glucose at the first carbon yields

A) Gluconic acid

B) Aldonic acid

C) Glucuronic acid

D) Glucaric acid

C

Specific test for galactose

A) Barfoed’s test

B) Bial’s test

C) Mucic acid test

D) Phloroglucinol test

C