Answer: Lacks the phosphate group.
- A Lacks the phosphate group
- B Lacks the sugar according to most researchers
- C Lacks the base in the majority of cases studied
- D Is a polymer as widely reported
Correct answer: A. Lacks the phosphate group
Explanation: A nucleoside = base + sugar; a nucleotide = base + sugar + phosphate.
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.