Amino Acids: Structure and Classification
- Previous year questions on Amino Acids: Structure and Classification for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Biochemistry section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 112 live questions in Amino Acids: Structure and Classification.
- 2 of 112 questions carry a verified exam year: 2018, 2020.
- Biochemistry is worth about 16 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 3 Sept 2026.
Q1.Replacing alanine by which amino acid, will increase UV absorbance of protein at 280 nm wavelength?
- ATryptophan✓ Correct answer
- BArginine
- CGuanine
- DLysine
Q2.Which of the following amino acid is both polar and ionic?
- AArginine✓ Correct answer
- BAsparagine
- CGlutamine
- DLeucine
Q3.Essential amino acids are all except:
- ALeucine
- BLysine
- CMethionine
- DProline✓ Correct answer
Q4.Replacing alanine by which amino acid will increase UV absorbance of protein at 280nm wavelength
- Atryptophan✓ Correct answer
- BArginine
- CGuanine
- DLysine
Q5.One of the following is not an amino acid:
- AGlycine
- BHydroxy proline
- CGlutamic acid
- DCholine✓ Correct answer
Q6.Which of the following is having Maximum buffering capacity
- AHistidine✓ Correct answer
- BCysteine
- CTyrosine
- DArginine
Q7.At physiological pH, which of these amino acids has a positive charge?
- AValine
- BAspartic acid
- CArginine✓ Correct answer
- DIsoleucine
Q8.Following are the essential amino acids:
- APhenylalanine, Tryptophan, Lysine✓ Correct answer
- BPhenylalanine, Asparagine, Methionine
- CPhenylalanine, Valine, Glycine
- DHistidine, Glutamine, Valine
Q9.Which one of the following is the amino acid in Hb that accepts H+ and allows Hb to act as a buffer to acids?
- AAlanine
- BHistidine✓ Correct answer
- CSerine
- DThreonine
Q10.Which of the following is a dipeptide?
- Acarnosine✓ Correct answer
- BGlutathione
- CGlucagon
- Dβ-Lipoprotein
Answer key
Q1: A. Tryptophan; Q2: A. Arginine; Q3: D. Proline; Q4: A. tryptophan; Q5: D. Choline; Q6: A. Histidine; Q7: C. Arginine; Q8: A. Phenylalanine, Tryptophan, Lysine; Q9: B. Histidine; Q10: A. carnosine.
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