Answer: Four.
- A Six
- B Three
- C Five
- D Four
Correct answer: D. Four
Explanation: Open-chain glucose has four chiral carbons (C-2, C-3, C-4 and C-5), giving rise to its many stereoisomers.
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.