A protein consisting of more basic amino acids such as ----------exists as a cation at the physiological pH of 7.4. Such proteins are called basic proteins.

Step-by-step solution

Basic amino acids contain an extra amino group in their side chain, which gets protonated at the physiological pH of 7.4 to form a cation. Examples of basic amino acids include lysine, arginine, and histidine. Therefore, a protein consisting of more basic amino acids such as lysine and arginine exists as a cation at physiological pH and is called a basic protein. Answer: Lysine and arginine