Answer: mRNA.
- A mRNA
- B tRNA
- C rRNA
- D snRNA
Correct answer: A. mRNA
Explanation: mRNA is highly unstable and has a short lifespan as it encodes transient instructions for protein synthesis.
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.