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MCQ006 Savepaper…Savetrees…
FormoreQuestionsandResourcesforyourCSIR/ICMR/DBT/ICAR/UGC/JRFNETLifeScienceExaminationpleasevisit:
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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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