Amino acids & proteins quiz 3


#1

QUES 1. A vasodilating compound is produced by the decarboxylation of the amino acid:

Histidine

Arginine

Aspartic acid

Glutamine

QUES 2. Biuret reaction is specific for

–CSNH2 group

–(NH)NH2 group

–CONH-linkages

All of these

QUES 3. Sakaguchi’s reaction is specific for

Tyrosine

Arginine

Proline

Cysteine

QUES 4. Million-Nasse’s reaction is specific for the amino acid:

Tryptophan

Arginine

Phenylalanine

Tyrosine

QUES 5. Ninhydrin with evolution of CO2 forms a blue complex with

α -Amino acids

Peptide bond

Histamine

Serotonin

QUES 6. The most of the ultraviolet absorption of proteins above 240 nm is due to their content of

Aspartate

Glutamate

Tryptophan

Alanine

QUES 7. Which of the following is a dipeptide?

Glutathione

Glucagon

β -Lipoprotein

Anserine

QUES 8. Which of the following is a tripeptide?

Oxytocin

Glutathione

Anserine

Kallidin

QUES 9. A peptide which acts as potent smooth muscle hypotensive agent is

Glutathione

Gramicidin-s

Tryocidine

Bradykinin

QUES 10. A tripeptide functioning as an important reducing agent in the tissues is

Bradykinin

Kallidin

Tyrocidin

Glutathione