30 Questions
What is the primary chemical nature of enzymes?
Proteins
How many classes of enzymes are there based on the types of chemical reactions they catalyze?
6
What is the purpose of using enzymes in clinical diagnosis, treatment, and research?
To detect and treat medical conditions
What is the primary structural feature of most enzymes?
They are globular proteins.
Which of the following factors can affect enzyme activity?
All of the above
What is the term used to describe the specific fit between an enzyme and its substrate?
Stereospecificity
What type of enzyme contains both a protein and a nonprotein portion?
A conjugated enzyme
Which of the following statements about apoenzymes is true?
An apoenzyme has both a protein and nonprotein part
Which of the following substances is an enzyme based on its name?
Lactase
Which statement about an enzyme active site is true?
It always has a geometrical shape exactly complementary to that of the substrate
Which type of enzyme contains a cofactor?
An enzyme in which a cofactor is present
Which statement about apoenzymes is false?
An apoenzyme has both a protein and nonprotein part
What is the term used to describe the relatively small part of an enzyme's structure that is actually involved in catalysis?
Enzyme active site
Which model of enzyme action proposes that the active site has a flexible shape that can change to accept a variety of related substrates?
Induced-fit model
Which type of enzyme specificity describes an enzyme that will catalyze only one reaction?
Absolute specificity
How does the rate of enzyme activity change as temperature increases?
The rate increases until the protein is denatured, then drops sharply.
What is the term used to describe the intermediate reaction species that is formed when a substrate binds to the active site of an enzyme?
Enzyme-substrate complex
Which type of enzyme specificity describes an enzyme that will act on a particular type of chemical bond, irrespective of the rest of the molecular structure?
Linkage specificity
What is the primary function of enzymes?
All of the above
Which of the following statements about enzyme structure is correct?
Some enzymes are made of ribonucleic acids (RNA)
What is a conjugated enzyme?
An enzyme that has a nonprotein part in addition to a protein part
What is the role of the apoenzyme in a conjugated enzyme?
It is the protein part of the enzyme
What is a holoenzyme?
The biochemically active conjugated enzyme produced from an apoenzyme and a cofactor
Which of the following statements about enzyme specificity is correct?
Enzymes are highly specific to a type of reaction
Which of the following is NOT a simple metal ion cofactor?
Coenzyme A (CoA)
What is the role of the active site in an enzyme's structure?
To provide a pocket that holds specific substrates for reactions
Which of the following coenzymes is NOT synthesized within the human body?
Coenzyme A (CoA)
What does the suffix "-ase" indicate in an enzyme's name?
That the substance is an enzyme
What happens after an enzyme has catalyzed a reaction?
The enzyme releases the finished products and continues working on more substrates
Which of the following statements about enzyme nomenclature is NOT true?
The identity of the substrate is always noted in the enzyme's name
Test your knowledge on enzymes with this quiz covering the description, functions, nomenclature, classification, general nature, and uses of enzymes in clinical diagnosis, treatment, and research. Learn about the chemical nature of enzymes, the six classes of enzymes based on the type of reactions they catalyze, and factors affecting enzyme activity.
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