Question

Which of the following enzymes is not of protein origin?
a) Hexokinase
b) Synthetase
c) Endonuclease
d) Ribozyme

Answer 1

Hint: As we are aware of the name restriction enzymes in mostly biotechnology subjects. It is the most common tool; biological tool being used in the biotechnology field. Restriction enzymes as the name suggests are nothing but biological markers which are being produced to cleave or cut DNA at the desired specific sites.

Complete answer:
d) Ribozyme – a minority of enzymes are not derived from proteins. For example- ribozymes. It is a RNA molecule enzyme. They catalyze splicing of introns and RNA in eukaryotic mRNA.
Option D is the correct answer.
a) Hexokinase- hexokinase enzyme is the derivative of protein origin which phosphorylates the hexoses. Belong to glucokinase family.
Option A is not the correct answer.
b) Synthetase- another protein-oriented enzyme used for catalyzing the linkage of two molecules of pyrophosphate group and triphosphate group.
Option B is also incorrect.
c) Endonuclease- Restriction enzymes are commonly called restriction endonuclease. It is called endonuclease as it makes cuts from inside of the DNA strands. Endo means inner side, so it makes cuts from inward of the recognition site and exonuclease which means making cuts from the outward of the DNA strand.
Option C is not the correct answer.

Note:
Enzymes are mostly derived from protein origin. They are helpful for promoting and enhancing the rapidity of any reaction. Enzymes have a lock and key mechanism by which they get attached to the specific substrate and perform a reaction.