18. Enzymes that cleave carbon-carbon bonds without the use of water in the chem

Question

18. Enzymes that cleave carbon-carbon bonds without the use of water in the chemical reaction are members of which class of enzymes? A) oxidoreductases B) transferases C) hydrolases D) lyases 19. Which statement regarding enzyme activity is CORRECT? A) B) C) D) Enzymes bind their substrates better than the transition state. Enzymes bind the transition state better than the reaction products. Enzymes reduce the activation energy required for the reaction to take place. Enzymes bind their substrates better than the transition state and the transition state better than the reaction products. Enzymes bind the transition state better than the reaction products and reduce the activation energy required for the reaction to take place. E) 20. A reaction that has a AG of 25 kJ/mol is likely to have which property? A) B) C) D) E) a large equilibrium constant a small equilibrium constant a slow reaction rate both a large equilibrium constant and a slow reaction rate both a small equilibrium constant and a slow reaction rate 21. Binding energy between an enzyme and a substrate contributes to catalysis in which way? A) Binding energy provides the enzyme specificity for the substrate B) Binding energy contributions allow for entropy reduction in the substrate-enzyme C) D) E) complex. Binding energy compensates for energy changes as a result of desolvation of the substrate. Binding energy contributes to the process of induced fit between the substrate and the enzyme. All of the answers are correct.

Explanation / Answer

Ans 18

Option D is the correct answer

Lyases are the class of enzymes that cleave the bonds of

Carbon - carbon ( C-C,), Carbon - oxygen (C-O,), carbon - nitrogen (CN) rather than the use of water or oxygen (hydrolysis or oxidation respectively). a new ring or a double bond product is formed by this process.

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