State three important characteristics related to the behaviour of gas particles according to the kinetic theory of gases (KTG).

Can someone me with questions 15 to 17 plz.

#7 how does the structure of amino acids allow them to form a polypeptide? each amino acid has an amino group and a carboxyl group. each amino acid has a hydrogen atom and a carboxyl group. each amino acid has a carboxyl group and an r group. each amino acid has an r group and a hydrogen atom.

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!