A simple enzyme is
A) Succinate dehydrogenase
B) Urease
C) Transaminase
D) Ribozyme

Hint: Simple enzyme is the enzymes, which are made up of only proteins. They don’t contain any chemical group other than amino acids. They catalyze their substrate-specific reaction.

Complete answer:
>Urease is an enzyme that is only made up of protein. Its main function is to catalyze the hydrolysis of the urea, hydrolysis of urea results in the formation of ammonia and carbon dioxide. So, as simple enzymes are the ones that are only formed of proteins therefore, B is the correct answer.
>Talking about succinate dehydrogenase, it is present in the inner mitochondrial membrane.
The main role of succinate dehydrogenase is that it plays an important role in the citric acid cycle and electron transport chain. It consists of four polypeptides and catalyzes the conversion of succinate into fumarate, an important step of the citric acid cycle. Therefore, option A is not the correct answer. >Transaminase is an enzyme that catalyzes the transamination reaction between an amino acid and alpha-keto acid. Alpha keto is a carbonyl compound. The transfer of the amino group to the carbonyl group takes place. Therefore, option C is also an incorrect option.
>Talking about option D, the ribozyme is an RNA enzyme. These enzymes are found in ribosomes. They help in catalyzing specific biochemical reactions for example RNA splicing. Therefore, option D is not the correct answer.

Hence the correct answer is option ‘B’.

Note: Urease is found in large quantities in jack beans, soybeans, and other plant seeds, it also occurs in some animal tissues and intestinal microorganisms. Ureases belong to the superfamily of amidohydrolases and phosphotriesterases.