Enzyme Regulation - Biochemistry | Biology+

Course

Biochemistry

Study Pack

Set 1: The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Set 2: Water: the Medium of Life

Set 3: Thermodynamics of Biological Systems

Set 4: Amino Acids and the Peptide Bond

Set 5: Proteins: Their Primary Structure and Biological Functions

Set 6: Proteins: Secondary, Tertiary, and Quaternary Structure

Set 7: Carbohydrates and the Glycoconjugates of Cell Surfaces

Set 9: Membranes and Membrane Transport

Set 10: Nucleotides and Nucleic Acids

Set 11: Structure of Nucleic Acids

Set 12: Recombinant Dna, Cloning, Chimeric Genes, and Synthetic Biology

Set 13: Enzymeskinetics and Specificity

Set 14: Mechanisms of Enzyme Action

Set 15: Enzyme Regulation

Set 16: Molecular Motors

Set 17: Metabolism: an Overview

Set 18: Glycolysis

Set 19: The Tricarboxylic Acid Cycle

Set 20: Electron Transport and Oxidative Phosphorylation

Set 21: Photosynthesis

Set 22: Gluconeogenesis, Glycogen Metabolism, and the Pentose Phosphate Pathway

Set 23: Fatty Acid Catabolism

Set 24: Lipid Biosynthesis

Set 25: Nitrogen Acquisition and Amino Acid Metabolism

Set 26: Synthesis and Degradation of Nucleotides

Set 27: Metabolic Integration and Organ Specialization

Set 28: Dna Metabolism: Replication, Recombination, and Repair

Set 29: Transcription and the Regulation of Gene Expression

Set 30: Protein Synthesis

Set 31: Completing the Protein Life Cycle: Folding, Processing, and Degradation

Set 32: The Reception and Transmission of Extracellular Information

Set 15 Enzyme Regulation

✕

Set 15 Enzyme Regulation

(Multiple Choice)

Free

Adenylyl cyclase catalyzes the synthesis of cAMP, and cAMP hydrolysis is catalyzed by a 5'-phosphodiesterase. If caffeine inhibits 5'-phosphodiesterases, drinking a caffeinated beverage would ____ cAMP levels and ____ glycogen phosphorylase activity.

A) increase; decrease
B) increase; increase
C) decrease; decrease
D) decrease; increase
E) have no effect; have no effect

Answer

(Multiple Choice)

Free

All of the following are correct statements about enzyme regulation EXCEPT:

A) Enzymes can be inhibited by the products they produce.
B) Enzymes can be inactivated by the addition of a functional group.
C) Coenzyme and substrate availability can regulate enzyme reaction rate.
D) The reaction rate slows as equilibrium is approached.
E) The activity of an enzyme is covalently affected by allosteric regulators.

Answer

(Multiple Choice)

Free

Characteristics of glycogen phosphorylase include all EXCEPT:

A) covalently linked pyridoxal phosphate.
B) an active site at the center of each of two identical subunits.
C) regulatory phosphorylation site on a Ser residue.
D) allosteric effector sites for ATP and glucose-6-phosphate.
E) all are true.

Answer