The given diagram represents a generalized reaction between an amino acid-AMP complex and a tRNA molecule. Which of the following statements is true if the -R group is a hydrogen atom (-H) in one reaction and a methyl group (-CH₃) in another reaction? A) Both the reactions will have a common enzyme; however, they will have different tRNA molecules. B) Both the reactions will have a common tRNA molecule; however, they will use different enzymes. C) Both the reactions will have a common tRNA molecule as well as a common enzyme. D) Both the reactions will have different enzymes as well as different tRNA molecules.

Question

Quizplus · Accepted Answer

The -R group of an amino acid can significantly affect the properties of the amino acid, and thus, the enzyme that modifies it. If the -R group is different in two reactions, then it is likely that different enzymes will be involved in the modification of the amino acid. Additionally, tRNA molecules are specific to particular amino acids, so a change in the -R group may necessitate a change in the tRNA molecule used in the modification reaction as well. Therefore, the correct answer is option D, which states that both the reactions will have different enzymes and different tRNA molecules.

The Given Diagram Represents a Generalized Reaction Between an Amino