Answer: Uracil.
- A Uracil
- B Thymine
- C Cytosine
- D Guanine
Correct answer: A. Uracil
Explanation: RNA contains uracil instead of thymine found in DNA.
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.