Which of the following statements is true regarding a basic amino acid? the positively charged r group of a basic amino acid could bind dna. all of these choices are correct. the hydrophilic r group of a basic amino acid will be located in the interior of a protein. a basic amino acid would be considered both polar and hydrophobic. the r group of a basic amino acid would only be able to form covalent bonds with other molecules.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms