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Biochemistry:AminoAcidsPart1(MCQ005)

1. Whichofthefollowingaminoacidissweetintaste?a. Glycineb. Alanine

c. Glutamicacidd. Noneofthese

2. Whichofthefollowingaminoacidactasinhibitoryneurotransmitter?a. Glycineb. Alaninec. GABA

d. Allofthesee. Noneofthese

3. TheaminoacidcommonlyusedasaningredientinthebuffersofSDSPAGE.a. Asparticacidb. Glutamicacidc. Glycined. AsparticacidandLysinetogether

4. Whichofthefollowingaminoacidwillbeabsentinα(alpha)helixstructureofprotein?

a. Glycineb. Galine

c. Glutamicacidd. Proline

5. Aminolevulinicacid,thefirstproductinporphyrinbiosynthesisineukaryotes,issynthesizedfrom_______andsuccinyl‐CoA.

a. Valineb. Tryptophan

c. Methionined. Glycine

6. Carnosineisadipeptideofhistidineand________a. β‐histidineb. β‐alaninec. β‐lysine

d. α‐lysinee. Tryptophan

7. WhichofthefollowingenzymecontainSelenocysteine?a. Nitratereductaseb. Catalase

c. Glutathioneperoxidased. Allofthese

8. Aminoacidusedinthe‘stripping’ofWesternblottingexperimentis:a. Glutamicacidb. Phenylalanine

c. Alanined. Glycine

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9. Totalnumberofproteinogenic(proteinbuilding)aminoacidsinthelivingworldis____.

a. 20b. 21

c. 22d. 23

10. Aminoacidselenocysteineiscodedby_______a. UAAb. UAG

c. UGAd. AUG

11. Whichofthefollowingisaglucogenicaminoacid?a. Glycineb. Prolinec. Alanine

d. Both(a)and(b)e. Allofthese

12. Whichofthefollowingaminoacidactasexcitatoryneurotransmitter?a. Glutamateb. Aspartatec. Cysteine

d. Allofthesee. Noneofthese

13. Whichaminoacidactastheprecursorofnucleotidebiosynthesis?a. Aspartateb. Glycinec. Glutamine

d. Both(a)and(b)e. Allofthese

14. BacteriaprefertousethecodonCGAinsteadofAGAtocodeforArginine.Thisisanexamplefor

a. Secondgeneticcodeb. Nullomersc. Transcriptionaldecodingd. Allomers

15. Whichofthefollowingisanexampleforabio‐plastic?a. Polyaspartateb. Polyglutamate

c. Poly‐L‐lysined. Allofthese

16. Histonesarerichin__________.a. Lysineb. Arginine

c. Histidined. LysineandArginine

17. Singlelettercodeofpyrrolysineis_______.a. Bb. J

c. Od. U

18. Whichofthefollowingisnotanessentialaminoacid?a. Prolineb. Histidine

c. Leucined. Methionine

19. WhatisthemolecularweightofGlycine?www.easy

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a. 75g·mol−1b. 80g·mol−1

c. 90g·mol−1d. 95g·mol−1

20. Amongthe20standardproteinscodingaminoacids,whichoneisleastoccursinproteins?

a. Glycineb. Alaninec. Tryptophand. Methionine

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