Answer:
b. All are enzymes
Step-by-step explanation:
"Every enzyme is a protein, but not every protein is an enzyme." You may have heard that phrase already.
With the exception of one group of RNA molecules with enzymatic activity, every enzyme is a protein.
Proteins, in addition to enzymes, can perform many other functions in the cell, such as structural and transport functions. Protein is a type of substance formed from a set of linked amino acids (called peptide bonds). In other words, proteins are composed of carbon, hydrogen, oxygen and nitrogen molecules.