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BiologyMCQ(MultipleChoiceQuestionsinLifeScience)(Sample/Model/PracticeQuestionsforJRF/NETLifeScienceExamination,ICMRJRF,DBTJRF,GATE,ICARNET,PGEntrance)

MCQBiochemistry:AminoAcidsPart4(MCQ008)

1. Whichgroupofafullyprotonatedglycine(NH3+‐CH2–COOH)firstreleasea‘proton’whenitistitratedagainst–OH‐ions?

a. Carboxylgroupb. Aminogroupc. Bothatthesametimed. Itcannotbepredicted

2. pKaisthemeasureofagroupto__________proton.a. Takeupb. Release

c. Combined. Consume

3. Whichofthefollowingaminoacidbearsaguanidinegroupinthesidechain?a. Lysineb. Arginine

c. Histidined. Proline

4. Theprecursorofglycinesynthesisinmicrobesandplantsis_______.a. Serineb. Leucine

c. Valined. Noneofthese

5. Singlelettercodeofselenocysteineis_____.a. Bb. J

c. Ud. O

6. Whichofthefollowingaminoacidhaveaniminogroupinthesidechain?a. Prolineb. Asparagine

c. Glutamated. Histidine

7. 4‐hydroxyproline(aderivativeofproline)isabundantlypresentin_______.a. Keratinb. Myoglobin

c. Hemoglobind. Collagen

8. Desmosineisacomplexderivativeoffive____________residues.a. Lysineb. Arginine

c. Histidined. Methionine

9. IsoelectricpHisdesignatedas______.a. pKab. pIc. Piwww.ea

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d. Noneofthese10.WhichofthefollowingaminoacidisbiosynthesizedfromRibose5‐phposphate?

a. Histidineb. Serine

c. Glycined. Allofthese

11. AminoacidbiosynthesizedfromPyruvateofglycolysisis_____.a. Alanineb. Valine

c. Leucined. Allofthese

12. Aromaticaminoacids(Phenylalaine,Tyrosine,andTryptophan)arederivedfromPhosphoenolpyruvateand__________.

a. Ribose5‐phosphateb. Erythrose4‐phosphatec. Oxaloacetated. α‐ketoglutarate

13. Isoleucineisderivedfrom___________.a. Methionineb. Threonine

c. Lysined. Leucine

14. Bloodclottingproteinthrombinusuallycontainwhichofthefollowingmodifiedaminoacid?

a. 4‐hydroxyprolineb. 5‐hydroxylysinec. 6‐N‐methyllysined. γ‐carboxyglutamate

15. Cysteineisnotanessentialaminoacidinhuman,sincewehavethemachinerytosynthesizecysteinefromothertwoaminoacidsnamely_______andserine.

a. Methionineb. Selenocysteinec. Citrullined. Hydroxyproline

16.Whichofthefollowingcontainadisulfidebridge?a. Cysteineb. Cystinec. Methionine

d. Noneofthesee. Allofthese

17.Whichofthefollowingproteincontainamodifiedaminoacid–desmosine?a. Keratinb. Gelatinc. Elastind. Collagen

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18. Duringbiosynthesis,MethionineandThreoninearederivedfromacommonintermediate:

a. Chorismateb. Citrullinec. Homoserined. Cystathione

19. 6‐N‐methyllysineisaderivativeoflysine,presentin__________.a. Keratinb. Collagenc. Myosind. Myoglobin

20. AcommonintermediatebranchpointinthesynthesisofallaromaticaminoacidssuchasTryptophan,PhenylalanineandTyrosineis________

a. Homoserineb. Chorismatec. Cystathioned. Noneofthese

21. Sarcosine,aubiquitousnonprotenaciusaminoacidinanimalsandplantsis____.a. N‐methylglycineb. N‐methylvalinec. N‐methylserined. N‐methylmethionine

 

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