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LifeSciencesMCQModelQuestions

MultipleChoiceQuestions

Biochemistry:AminoAcidsPart2(MCQ006)

1. Whichaminoacid,amongthe20standardproteincodingaminoacids,ismostabundantlyoccursinproteins?

a. Glycineb. Methionine

c. Serined. Leucine

2. Whichofthefollowingaminoacidishavingmorepolarity?a. Lysineb. Arginine

c. Histidined. Aspartate

3. Majorityofenzyme’sactivesiteusuallycontainoneormore_____residue.a. Glycineb. Tryptophan

c. Histidined. Arginine

4. Thefollowingistheaminoacidsequenceofanalienpolypeptide:‘AGQHIKXSKPWYVGLBUFF’.The‘X’inthegivensequencerepresents___________.

a. Asparagineb. Isoleucinec. Anambiguousaminoacidd. Anunknownaminoacid

5. Aminoacidactingasadefensivemoleculeinplants:a. Canavanineb. Con‐canavalin

c. Prolined. Allofthese

6. Whichaminoacidactastheprecursorforthesynthesisoftheneurotransmitterserotonin?

a. Tyrosineb. Tryptophan

c. Glycined. Arginine

7. _____isanexclusivelyketogenicaminoacidinhuman.a. Valineb. Methionine

c. Leucined. Proline

8. pIof___________isneartophysiologicalpH.a. Lysineb. Histidinec. Arginined. Glutamicacidwww.ea

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9. Whichaminoacidactastheprecursorofdopamine?a. Glycineb. Aspartatec. Valined. Tyrosine

10. WhatisthemolecularweightofTryptophan?a. 202g.mol‐1

b. 204g.mol‐1c. 206g.mol‐1d. 208g.mol‐1

11. AminoacidwhichactastheprecursorofIAA(indole2‐aceticacid)biosynthesisinplantsis_____.

a. Tyrosineb. Phenylalanine

c. Tryptophand. Methionine

12. Aminoacidinvolvedinureacycle____.a. Ornithineb. Citrullinec. Arginine

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

13. WhichofthefollowingaminoacidhavethebufferingcapacityatphysiologicalpH?a. Lysineb. Arginine

c. Histidined. Asparticacid

14. Aminoacidwhichactastheprecursorofepinephrinesynthesisis_____.a. Glycineb. Aspartate

c. Tyrosined. Valine

15. Whichaminoacidactastheprecursorofnitricoxidebiosynthesisinanimals?a. Phenylalanineb. Argininec. Aspartated. Ornithine

16. Whichofthefollowingisanessentialaminoacid?a. Asparticacidb. Alaninec. Leucined. Asparaginee. Allofthese

17. Whichofthefollowingisanon‐essentialaminoacid?a. Alanineb. Histidinec. Lysined. Methioninewww.ea

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e. Allofthese18. Whichofthefollowingaminoacidiscodedbyasinglecodon?

a. Lysineb. Argininec. Tryptophand. Phenylalanine

19. Firstdiscoveredaminoacidis____.a. Asparagineb. Aspartatec. Glutamated. Glutamine

20. Amongthe20standardproteincodingaminoacids,whichwasthelastdiscoveredaminoacid?

a. Leucineb. Isoleucinec. Threonined. Serine

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