<Li> Messengers, by transmitting messages to regulate biological processes . This function is done by hormones, i.e. insulin etc . </Li> <Li> Transporters of other molecules through membranes </Li> <Li> Stocks of amino acids . </Li> <Li> Regulatory roles are also performed by globular proteins rather than fibrous proteins . </Li>

The 3-d structure of a protein requires which of the following