Question

if protease breaks down proteins, what building block are the proteins broken down to?

nucleotides

glucose

amino acids

fatty acids

Explanation:

Proteins are polymers made of amino acids as their monomeric building blocks. Proteases (protein - digesting enzymes) break down proteins into their constituent amino acids. Nucleotides are the building blocks of nucleic acids (DNA and RNA), glucose is a monosaccharide (building block of carbohydrates like starch or glycogen), and fatty acids are part of the building blocks of lipids (along with glycerol). So the correct building block that proteins are broken down into by proteases is amino acids.

Answer:

amino acids (assuming the option with "amino acids" is the correct choice; since the options' formatting is a bit unclear, but based on biological knowledge, proteins are broken down into amino acids by proteases)