Which of the following is not a function of proteins? a. Provide structure. b. Enzymes and hormones. c. Antibodies. d. Transfer and storage. e. All of the above are functions of proteins. Solution e. All of the above are functions of proteins. becausea protein provided structure to body\'s tissued.They work as enzymes to improve chemical reaction.They work as antibodies to fight infection and it helps to transfer oxygen in the body.So all of them are functions of proteins..