A) ligases
B) isomerase
C) lyases
D) transferases
Correct Answer: A
Solution :
Enzymes are proteinaceous compounds that accelerate a chemical reaction without changing its direction. On the basis of types of reaction they catalyse the enzymes are of following six types: Oxidoreductas (i): Transfer of H and O atoms or electrons from one substance to another, e.g., Dehydrogenase, oxidase, catalases. (ii) Transferases: Transfer of a functional group from one substance e.g., Phosphorylase, kinase. (iii) Hydrolases: Hydrolysis of the substrate e.g., Lipase, amylase, peptidase, protease etc. (iv) Lyases: Splitting of C-C, C-O, C-N, C-H and other similar bonds not by hydrolysis thereby leaving a double bond. e.g., Decarboxylase, fumarase, aldolase. (v) Isomerases: Change of a substrate into a related form by intramolecular rearrangement e.g., Phosphohexoisomerase. (vi)Ligases (synthatases): Joining of two molecules by forming new bonds with simultaneous break down of ATP e.g., Acyl Co-A synthase, pyruvate carboxylase.
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