Answer: They are joined by ester bonds not polymerised like polysaccharides; no repeating monomer units.
- A They are joined by ester bonds not polymerised like polysaccharides; no repeating monomer units
- B Their fatty acid chains contain no carbon-carbon bonds capable of linking units together
- C They are completely insoluble in water and in every organic solvent tested
- D Their individual molecular weight is far too low to ever form a repeating chain
Correct answer: A. They are joined by ester bonds not polymerised like polysaccharides; no repeating monomer units
Explanation: Fats are triesters of glycerol and fatty acids, not true polymers made of repeating identical monomers.
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.