In which of the following is hydrogen bonding a key stabilizing force: beta pleated sheets, cellulose, fatty acid tail interaction in a lipid bilayer, interaction of peripheral membrane proteins with a biological membrane?

Which of the following statements is true regarding a basic amino acid? a.) the hydrophilic r group of a basic amino acid will be located on the interior of a protein b.) the positively charged r group of a basic amino acid could bind dna c.) the r group of a basic amino acid would only be able to form covalent bonds with other molecules d.) a basic amino acid would be considered both polar and hydrophobic e.) all of the above