Question 1

Many allosteric enzymes have two types of subunits,termed

Accepted Answer

A)  catalytic and regulatory. 
B)  regulatory and allosteric. 
C)  allosteric and regulatory. 
D)  R-state and T-state. 
E)  None of the answers is correct. 
A)  catalytic and regulatory. 
B)  regulatory and allosteric. 
C)  allosteric and regulatory. 
D)  R-state and T-state. 
E)  None of the answers is correct.

Question 2

What term describes enzymes that are activated by proteolytic cleavage?

Accepted Answer

A)  phosphatases 
B)  isozymes 
C)  kinases 
D)  zymogens 
E)  apoenzymes 
A)  phosphatases 
B)  isozymes 
C)  kinases 
D)  zymogens 
E)  apoenzymes

Question 3

Which of the following is an example of a zymogen?

Accepted Answer

A)  pepsinogen 
B)  procarboxypeptidase 
C)  T-form of ACTase 
D)  All of the answers are correct. 
E)  pepsinogen and procarboxypeptidase 
A)  pepsinogen 
B)  procarboxypeptidase 
C)  T-form of ACTase 
D)  All of the answers are correct. 
E)  pepsinogen and procarboxypeptidase

Question 4

Protein kinases add phosphoryl groups to serine,threonine,and _________________ residues in target proteins.

Accepted Answer

The answer of Protein kinases add phosphoryl groups to serine,threonine,and...

Question 5

Changes in ATCase conformation were detected by crystallizing the enzyme in the presence of PALA (N-(phosphonacetyl)-L-aspartate).What is PALA?

Accepted Answer

A)  a radioactive tag that binds to the subunits 
B)  a substrate analog that resembles the transition state 
C)  a fluorescent allosteric inhibitor analog 
D)  All of the answers are correct. 
E)  None of the answers is correct. 
A)  a radioactive tag that binds to the subunits 
B)  a substrate analog that resembles the transition state 
C)  a fluorescent allosteric inhibitor analog 
D)  All of the answers are correct. 
E)  None of the answers is correct.

Question 6

Allosteric proteins

Accepted Answer

A)  usually display hyperbolic Michaelis-Menten kinetics. 
B)  often display cooperativity. 
C)  always consist of several identical subunits. 
D)  usually display hyperbolic Michaelis-Menten kinetics and often display cooperativity. 
E)  All of the answers are correct. 
A)  usually display hyperbolic Michaelis-Menten kinetics. 
B)  often display cooperativity. 
C)  always consist of several identical subunits. 
D)  usually display hyperbolic Michaelis-Menten kinetics and often display cooperativity. 
E)  All of the answers are correct.

Question 7

What is the final step in the clotting pathway?

Accepted Answer

In the final step,fibrinogen,which conta

Question 8

Why is covalent modification advantageous when compared to proteolytic activation?

Accepted Answer

Covalent modificatio

Question 9

How does cigarette smoking relate to elastase function?

Accepted Answer

@#LAT-DLM&1-antitrypsin is a neutrophil protein th

Question 10

Why are certain forms of lactate dehydrogenase used as heart attack indicators?

Accepted Answer

LDH is a tetramer,made of M and H isozym

Exam 10: Regulatory Strategies

Many allosteric enzymes have two types of subunits,termed

What term describes enzymes that are activated by proteolytic cleavage?

Which of the following is an example of a zymogen?

Protein kinases add phosphoryl groups to serine,threonine,and _________________ residues in target proteins.

Changes in ATCase conformation were detected by crystallizing the enzyme in the presence of PALA (N-(phosphonacetyl)-L-aspartate).What is PALA?

Allosteric proteins

What is the final step in the clotting pathway?

Why is covalent modification advantageous when compared to proteolytic activation?

How does cigarette smoking relate to elastase function?

Why are certain forms of lactate dehydrogenase used as heart attack indicators?

Biochemistry: An Evolving Science

Protein Composition and Structure

Exploring Proteins and Proteomes

DNA, RNA, and the Flow of Genetic Information

Exploring Genes and Genomes

Exploring Evolution and Bioinformatics

Hemoglobin: a Portrait of a Protein in Action

Enzymes: Basic Concepts and Kinetics

Catalytic Strategies

Carbohydrates

Lipids and Cell Membranes

Membrane Channels and Pumps

Signal-Transduction Pathways

Metabolism: Basic Concepts and Design

Glycolysis and Gluconeogenesis

The Citric Acid Cycle

Oxidative Phosphorylation

The Light Reactions of Photosynthesis

The Calvin Cycle and the Pentose Phosphate Pathway

Glycogen Metabolism

Fatty Acid Metabolism

Protein Turnover and Amino Acid Catabolism

The Biosynthesis of Amino Acids

Nucleotide Biosynthesis

Biosynthesis of Membrane Lipids and Steroids

The Integration of Metabolism

DNA Replication, repair, and Recombination

RNA Synthesis and Processing

Protein Synthesis

The Control of Gene Expression in Prokaryotes

The Control of Gene Expression in Eukaryotes

Sensory Systems

The Immune System

Molecular Motors

Drug Development

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