Question

a bond linking 2 amino acids together is called a(n)
r group
peptide bond
amino group
carboxyl group
rewatch skip

Explanation:

To solve this, we analyze each option:

• R group: It's the side chain of an amino acid, not a bond linking amino acids.
• Peptide bond: Forms between the carboxyl group of one amino acid and the amino group of another, linking them.
• Amino group: A functional group ($-NH_2$) in an amino acid, not a bond between two.
• Carboxyl group: A functional group ($-COOH$) in an amino acid, not a bond between two.

So the correct answer is the option with "Peptide bond".

Answer:

The correct option is the one labeled "Peptide bond" (the second option in the list, with the text "Peptide bond").