Answer: Fatty acids.
- A Fatty acids
- B Amino acids
- C Nucleotides
- D Glucose
Correct answer: A. Fatty acids
Explanation: Triglycerides (fats) are formed by esterification of glycerol with three fatty acid molecules.
Two amino acids join via a condensation reaction: the carboxyl -OH of one and an amine -H of the other are eliminated as water, leaving a peptide bond (-CO-NH-) linking them into a dipeptide; repeating this builds a full protein chain.
Concept context
The chemistry of life: carbohydrates, proteins, lipids, nucleic acids, enzymes, and vitamins. Understand their structures, classification, and biological functions. Highly relevant for NEET and Class 12 board exams.