WorksheetsSAS 4 ENZYMES
Total questions: 20
Worksheet time: 12mins
The protein component of a conjugated enzyme.
Cofactor
Apoenzyme
Coenzyme
Holoenzyme
The active, biochemically functional form of a conjugated enzyme.
Cofactor
Coenzyme
Apoenzyme
Holoenzyme
The relatively small part of an enzyme’s structure that participates in catalysis.
Active site
Substrate-binding region
Allosteric site
Reaction interface
Catalytic cleft
What do you call an enzyme that consists solely of protein, without any non-protein components?
Coenzyme
Holoenzyme
Zymogen
Apoenzyme
Simple enzyme
What type of enzyme specificity focuses on a particular chemical bond, regardless of the rest of the molecular structure?
Group specificity
Absolute specificity
Linkage specificity
Stereochemical specificity
A microorganism that thrives in extremely high temperatures is called:
Psychrophile
Mesophile
Hyperthermophile
Halophile
A microorganism that thrives in extremely cold temperatures is called:
Cryophile
Mesophile
Alkaliphile
Halophile
Which model suggests that enzymes possess a rigid, complementary active site that exactly matches the substrate, without any structural changes upon binding?
Induced fit model
Substrate specificity model
Conformational model
Lock and key model
Based on the reaction shown in the image, which class of enzyme is responsible for catalyzing the hydrolysis of a chemical bond by adding water?
Hydrolase
Oxidoreductase
Transferase
Isomerase
Ligase
Match the enzyme class with its corresponding subclass: TRANSFERASE
Synthetase
Dehydrogenase
Lipase
Kinase
A factor that increases enzyme activity up to an optimal level but can denature the enzyme beyond it.
pH
Temperature
Enzyme concentration
Substrate concentration
The substrate for urease is (a) .
Which of the following statements is true regarding the effect of pH on enzyme activity?
Enzyme activity increases indefinitely with increasing pH.
Each enzyme has an optimal pH at which its activity is highest.
Enzymes are most active in acidic environments only.
pH does not affect enzyme activity.
Which of the following statements best explains the relationship between temperature and enzyme activity?
As temperature increases, the rate of the catalytic reaction increases indefinitely.
Enzyme activity is highest beyond a certain temperature threshold, after which denaturation occurs.
The optimum temperature is when an enzyme exhibits maximum activity.
Enzymes are most active at extremely high temperatures, regardless of the enzyme's structure.
Which of the following microorganisms thrives in environments with high salt concentrations?
Thermophile
Psychrophile
Alkaliphile
Halophile
Match the enzyme classification with its corresponding subclass: LYASE
Deaminase
Kinase
Mutase
Carboxylase
Match the enzyme subclass with its corresponding classification: NUCLEASES
Hydrolase
Isomerase
Oxidoreductase
Lyase
Which enzyme model describes the image shown?
Induced Fit Model
Lock and Key Model
Both A and B
Neither A nor B
Which of the following statements correctly distinguishes reversible competitive inhibition from reversible noncompetitive inhibition?
Competitive inhibitors bind to a site other than the active site, while noncompetitive inhibitors compete directly for the active site.
Competitive inhibition can be overcome by increasing substrate concentration, while noncompetitive inhibition cannot.
Noncompetitive inhibitors permanently disable the enzyme, while competitive inhibitors do not.
Competitive inhibition is irreversible, while noncompetitive inhibition is reversible.
What happens in reversible competitive inhibition?
The inhibitor permanently blocks the enzyme’s active site.
The inhibitor binds to a site other than the active site.
The inhibitor and substrate compete for the enzyme's active site.
The inhibitor destroys the enzyme completely.
