Circle all peptide bonds and amino residues in the following tetrapeptide. Alright, so remember, a peptide bond is basically an amide bond. So we're going to look for where we have a carbonyl single bonded to a nitrogen. If we take a look, here goes one of them.

This is an amide bond. Here goes a carbonyl carbon connected to a nitrogen. There goes another one. And then there goes our last one here. So we have 3 peptide bonds.

They say that it's a tetrapeptide, so that means we have 4 peptides connected to one another. So remember, this would represent 1 peptide. Remember, the amide bond is what connects 2 different peptides or 2 different amino acids to one another. So this is 1. Here goes the second one.

We're going to cut the amide bond. That's a second. Then here, this is another one. There goes another one. We should be circling it, but just for us to see me tracing where the peptide is.

And then finally, we have this last one here. So this represents our 4 peptides involved.