Question

Which of the following statement is correct about the enzymes?

• A. They are most active at pH 7.0.
• B. They are all amino acids.
• C. They are all proteins except ribozymes.
• D. They are most active at a temperature of 0${}^o$C.

Answer 1

The correct option is C They are all proteins except ribozymes.

All enzymes have different optimum pH values. For example, protein digesting enzymes are highly active at very low pH whereas salivary amylase is most active at alkaline pH. Biochemically enzymes are huge polymers of amino acids. They are not amino acids but are polymers of amino acids. Enzymes are active in narrow biological range of temperature and pH. Thus, enzymes become inactive at very low or very high temperature. Most of the enzymes barring a few exceptions are proteins. Few non-proteinaceous enzymes are catalytic RNAs.

So, the correct answer is 'They are all proteins except ribozymes.'