ENZYMES Flashcards
These substances are proteins that can act as a biological catalyst:
A. Hormones
B. Enzymes
C. Vitamins
D. Minerals
E. Carbohydrates
B. Enzymes
Nomenclature of enzymes are based on the following, except:
A. Nature of the general substrate
B. Name of the specific substrate
C. Type of reaction
D. Biosynthetic or catabolic nature
A. Nature of the general substrate
Which of the following is true regarding enzymes?
A. Are not reusable
B. Are needed in large amounts
C. Catalyze endergonic reactions only
D. Increase the energy of activation of the reaction
E. Decrease the energy of activation of the reaction
E. Decrease the energy of activation of the reaction
Enzymes that catalyze the reaction which joins two molecules or chemical groups:
A. Lyases
B. Ligases
C. Transferases
D. Oxidotransferases
B. Ligases
Proteases are examples of what general classification of enzymes?
A. Oxidoreductase
B. Lyases
C. Ligases
D. Hydrolase
E. Transferases
D. Hydrolase
The enzyme conformation adapts to the incoming substrate in:
A. Lock and Key Theory
B. Induced Fit Theory
C. Competitive Inhibition
D. Non – competitive inhibition
B. Induced Fit Theory
Which of this class of enzymes introduces a double bond by the removal of hydrogen?
A. Dehydrogenase
B. Dehyrolase
C. Decarboxylase
D. Lipase
A. Dehydrogenase
The type of inhibition reaction whereby the inhibitor competes with the substrate at the active site:
A. Competitive inhibition
B. Non – competitive inhibition
C. Reversible inhibition
D. Incomplete inhibition
A. Competitive inhibition
Milk curdling enzyme present in the gastric juice of infants:
A. Pepsin
B. Rennin
C. Trypsin
D. Maltase
E. Lactase
B. Rennin
Optimum temperature for enzyme activity in the body:
A. 40 °C
B. 60°C
C. 37°C
D. 10°C
C. 37°C
The activator metal of carbonic anhydrase is:
A. Zinc
B. Iron
C. Molybdenum
D. Magnesium
E. Nickel
A. Zinc
Enzymes that catalyze the anaerobic processes of carbohydrate metabolism are found predominantly in which part of a cell?
A. Cytoplasm
B. Membrane
C. Cell wall
D. Nucleus
E. Mitochondria
A. Cytoplasm
Enzymes concerned with the citric acid cycle are found in the:
A. Nucleus
B. Ribosomes.
C. Mitochondria
D. Non – particulate cytoplasm
C. Mitochondria
Protein kinase regulate the activities of key enzymes through which of the following?
A. Oxidation
B. Hydrolysis
C. Acetylation
D. Phosphorylation
E. Dephosphorylation
D. Phosphorylation
Enzymes for electron transport reactions are most active and concentrated in which of the following structures of the animal cell?
A. Nuclei
B. Lysosomes
C. Microsomes
D. Mitochondria
E. All of these
D. Mitochondria
Which of the following enzymes is essentially absent from normal mammalian muscle?
A. Glucokinase
B. Phosphorylase
C. Glucose-6-phosphatase
D. Glucose-6-phosphate isomerase
E. Glucose-6-phosphate dehydrogenase
C. Glucose-6-phosphatase
Dental plaque arises primarily as a result of enzymatic reactions using which of the following?
A. Sucrose and lipid
B. Sucrose and saliva
C. Glucose and saliva
D. Glucose and protein
B. Sucrose and saliva
Which of the following liver enzymes, absent from other tissues, gives the liver an advantage over other cells in taking up glucose after a meal?
A. Glucokinase
B. Aldolase
C. Hexokinase
D. Enolase
E. Glucose-6-phosphatase
A. Glucokinase
This is a fermenting enzyme that causes the conversion of monosaccharide into alcohol and carbon dioxide.
A. Carboxylase
B. Invertase
C. Zymase
D. Convertase
C. Zymase
A lipolytic enzyme capable of digesting dietary fat.
A. Lipase
B. Fatase
C. Ptyalin
D. Amylase
A. Lipase
Pepsinogen is an example of zymogen which is inactive. Pepsinogen is activated by:
A. HCl
B. Enterokinase
C. Ptyalin
D. Lyases
E. Trypsin
A. HCl
