Amino Acids Structure Variations — NEET Biology
✅ Asked in NEET 2016Which one of the following statements is wrong? (NEET 2016 Phase 1)
Which one of the following statements is wrong? (NEET 2016 Phase 1)
Answer & NCERT explanation
Correct answer: B — Glycine is a sulphur containing amino acid.
Glycine is the simplest amino acid with formula NH2-CH2-COOH, containing only hydrogen as its R group. It does NOT contain sulfur. Sulfur-containing amino acids are cysteine and methionine. All other options are correct: uracil is indeed a pyrimidine base, sucrose is a disaccharide, and cellulose is a polysaccharide.
Read more NCERT concept on the PYQ
The R group in these proteinaceous amino acids could be a hydrogen (the amino acid is called glycine), a methyl group (alanine), hydroxy methyl (serine), etc. Three of the twenty
The R group (side chain) of amino acids determines their identity and properties. While glycine has R=H and alanine has a methyl group, students often confuse which R groups contain special elements like sulphur or oxygen. The NEET trap: assuming all amino acids contain similar functional groups—glycine is the simplest (no R group complexity), while others like cysteine have sulphur, and serine/threonine have hydroxyl groups. Key to remember: glycine's R=H makes it unique (smallest, no chiral center), and each R group's chemical nature (polar, nonpolar, charged, or containing sulphur) affects protein folding and function. This concept appears because identifying amino acids by their R groups is fundamental to biochemistry.
What does NCERT say about R group these proteinaceous?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.