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Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Select true if the statement is CORRECT and false if OTHERWISE

1. Enzymes are catalysts and increase the speed of a chemical reaction without themselves undergoing any permanent chemical change.

2. Catalysis is defined as the acceleration of a chemical reaction

3. if the amount of the enzyme is kept constant and the substrate concentration is then gradually increased, the reaction velocity will decrease.

4. In the Induced-fit Model, if a dissimilar substance which does not fit the site is present, the enzyme rejects it

5. The Michaelis constant Vo is defined as the substrate concentration at 1/2 the maximum velocity.

6. A prosthetic group - an organic substance which is dialyzable and thermostable which is firmly attached to the protein or apoenzyme portion. 7. The rate of an enzyme-catalyzed reaction increases as the temperature is raised beyond optimum temperature.

8. Enzymes can be classified by the kind of chemical reaction catalyzed.

9. The living cell is the site of tremendous biochemical activity called metabolism.

10. Many enzymes require the presence of other compounds - cofactors - before their catalytic activity can be exerted.

11. The enzyme is thought to lengthen the "path" of the reaction.

12. In order to study the effect of increasing the enzyme concentration upon the reaction rate, the substrate must be present in an excess amount. 13. Transacetylases are transferases that transfer an acetyl group.

14. Beyond maximum velocity, increasing the amount of substrate in the system, while the enzyme concentration is constant, will further increase the enzyme activity.

15. Nicotinamide adenine dinucleotide (NAD) is a coenzyme for a great number of dehydrogenase reactions in which it acts as a hydrogen acceptor.

16. Oxidases change the geometry of a molecule

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