NEW
Font size
WorksheetsEnzyme and Protein Metabolism Quiz
Total questions: 20
Worksheet time: 10mins
Which enzyme deficiency causes Maple Syrup Urine Disease?
Phenylalanine hydroxylase
Branched-chain alpha-keto acid dehydrogenase
Tyrosinase
Homogentisate oxidase
What is the characteristic odor of urine in Maple Syrup Urine Disease?
Fruity
Burnt sugar
Musty
Ammonia
Nitric oxide is synthesized from which amino acid?
Tyrosine
Methionine
Arginine
Phenylalanine
Nitric oxide activates which intracellular enzyme?
Adenylate cyclase
Guanylate cyclase
Protein kinase A
Phospholipase C
Which of the following is a sulfur-containing amino acid?
Glycine
Tyrosine
Cysteine
Histidine
Which amino acid is exclusively ketogenic?
Valine
Leucine
Isoleucine
Threonine
Which is a precursor of serotonin and niacin?
Tryptophan
Phenylalanine
Histidine
Tyrosine
What is the major function of S-adenosylmethionine (SAM)?
Methyl group donor
Amino group acceptor
Phosphate group donor
Oxidizing agent
Which disease results from deficiency of phenylalanine hydroxylase?
Albinism
Alkaptonuria
Phenylketonuria
Maple syrup urine disease
What compound gives urine a black color in Alkaptonuria?
Homogentisic acid
Phenylpyruvate
Melanin
DOPA
Enzymes are biologically active ____
Lipids
Carbohydrates
Proteins
Nucleic acids
What is the meaning of Km in enzyme kinetics?
Maximum velocity
Substrate concentration at half Vmax
Enzyme concentration
Reaction time
Which graph is used to determine Km and Vmax accurately?
Bar plot
Michaelis-Menten plot
Lineweaver-Burk plot
Histogram
Which factor does NOT affect enzyme activity?
pH
Temperature
Light
Substrate concentration
Enzymes speed up reactions by lowering the ____
Activation energy
Product concentration
Enzyme concentration
Substrate binding
Which class of enzyme catalyzes oxidation-reduction reactions?
Transferases
Hydrolases
Oxidoreductases
Ligases
Which enzyme classification includes proteases?
Hydrolases
Lyases
Isomerases
Ligases
What does a higher Km value indicate?
Higher affinity
Lower affinity
More product
Less enzyme
Which of the following represents the correct enzyme-substrate complex formation theory?
Fluid mosaic model
Lock and key model
Diffusion model
RNA world theory
What is the purpose of Lineweaver-Burk plot?
To determine pKa
To calculate Vmax and Km
To measure pH
To plot enzyme concentration
