I think the answer to this is E
Answer: Proteins are broken down into amino acids by protease enzymes.
Explanation:
Protein is an essential nutrients which is needed for growth and development. Protein is the major constituent of hormones, enzymes, eyes, muscles e.t.c.
The protein sources are eggs,beans,meats, milk e.t.c.
Protein digestion start in the stomach. Once protein consume get to the intestine, hydrochloric acid and protease enzymes breakdown protein into amino acids.The Amino acids are linked together by peptides bond. The perform this by cleaving to the peptides bond within the protein by a process called hydrolysis.
The heart beating and the circulation of blood is "involuntary"
<span>Materials are anything consumed in the experiment; water or salt for example.
Apparatus would be such items as beakers and thermometers; things that are not consumed; things that you would expect to find in a lab as standard equipment </span>
