Which functional group is present in the enzyme reverse transcriptase?

• A. $\mathrm{Ketone}$
• B. $\mathrm{Protein}$
• C. $\mathrm{Amine}$
• D. $\mathrm{Alcohol}$

Answer: (B)

Verified step by step guidance

1. Understand the context: Reverse transcriptase is an enzyme, which is a type of protein. Enzymes are biological catalysts that speed up chemical reactions in living organisms.
2. Identify the functional groups typically found in proteins: Proteins are composed of amino acids, which contain amine groups (-NH2) and carboxylic acid groups (-COOH).
3. Consider the structure of amino acids: Each amino acid has an amine group and a carboxylic acid group, which are key functional groups in proteins.
4. Evaluate the options given: Ketone, Amine, Alcohol, and Protein. Since reverse transcriptase is an enzyme, it is primarily composed of amino acids, which contain amine groups.
5. Conclude that the functional group present in reverse transcriptase, as a protein, is the amine group, which is a characteristic functional group in amino acids.