Question

where does a peptide bond form?
o between the five - carbon sugar of one nucleotide and the phosphate group of another nucleotide
o between the r group of one amino acid and the carboxyl group of another amino acid
o between the amino group of one amino acid and the carboxyl group of another amino acid
o between the nitrogenous base of one nucleotide and the phosphate group of another nucleotide

Explanation:

A peptide bond is a covalent bond that links amino acids together in a protein. It forms through a condensation reaction where the amino group ($-NH_2$) of one amino acid reacts with the carboxyl group ($-COOH$) of another amino acid. Water ($H_2O$) is released during this reaction.

• Option A and D describe bonds in nucleotides (phosphodiester bonds in nucleic acids, not peptide bonds).
• Option B is incorrect as the R - group is not involved in forming the peptide bond. The R - groups are side chains that give amino acids their unique properties but do not participate in the formation of the peptide bond itself.

Answer:

C. between the amino group of one amino acid and the carboxyl group of another amino acid