Which of the following represents a peptide chain ?

Which of the following represent a peptide chain?

Which of the following represents a possible food chain found in a pond :

Which of the following is a peptide linkage?

Which of the following steps represents chain terminating step in the mechanism of chlorination of methane ?

Which one of the following is a peptide hormone ?

Which one of the following is a peptide hormone ?

Which one of the following is a peptide hormone ?