Answer: Pernicious anaemia.
- A Night blindness
- B Bleeding gums
- C Pernicious anaemia
- D Poor blood clotting
Correct answer: C. Pernicious anaemia
Explanation: Vitamin B12 (cyanocobalamin) is required for red blood cell formation; its deficiency leads to pernicious anaemia.
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.