Which best explains why a parasite needs a host? 1. Parasites use their host as a energy source.
2. Parasites use the immune system of their host.
3. Parasites use their host to increase their oxygen supply.

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