02Which of the following about types of chemical reactions catalyzed by enzymes
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Question
02Which of the following about types of chemical reactions catalyzed by enzymes are true (A) Dehydrogenase is belonged to oxidoreductase. (B) Kinase is one type of ligase since it adds a phosphate group to its substrate. (C) Ligase requires ATP molecule to work correctly. (D) Chymotrypsin is a protease. (E) Hexokinase (conversion of glucose to glucose-6-phospahte) has one substrate. Q3.Which of the following are true about cofactors for enzymes? (A) Inorganic metal ions, such as Zn2 and Fe2', are the examples of cofactors (B) Cofactors that are covalently bound to an enzyme protein are called prosthetic groups (ex. Heme). (C) An apoenzyme is the protein part of an enzyme that is not catalytically active until a cofactor is bound (D) All enzymes are proteins. (E) Without cofactors, enzymes could not bind substrate(s).Explanation / Answer
Ans 1. C) They lower the activation energy for the conversion of substrate to product.
The enzymes are also called as biological catalysts . For the substrates to form products , they need to cross an activation energy barrier . Enzymes lower this barrier and cause more number of substrate molecules to get converted into the products.
3) Option C
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