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  Easy NEET Notes – Biomolecules Types   CBSE Class 11 Biomolecules: Amino acids, lipids, and nucleic acids explained with clear diagrams for easy exam preparation. - Dr.Sanjaykumar Pawar  1. Proteinaceous Amino Acids What is an Amino Acid? Amino acids are the building blocks of proteins . Every amino acid contains: Amino group (–NH₂) Carboxyl group (–COOH) Hydrogen atom (H) R group (Side chain) → makes each amino acid different. R Group (Side Chain) The R group decides the type and properties of an amino acid. Examples: Glycine (Gly) → R = Hydrogen (H) → Simplest amino acid. Alanine (Ala) → R = Methyl group (–CH₃). Serine (Ser) → R = Hydroxymethyl group (–CH₂OH). NEET Tip: R group is responsible for the unique nature of every amino acid. Types of Amino Acids (Based on Amino & Carboxyl Groups) 1. Acidic Amino Acids Have more carboxyl (–COOH) groups than amino groups. Carry a negative charge. Example: Glutamic acid. Easy T...