MT QUIZ 1: Enzymes and Bioenergetics

Which component of an enzyme is the protein portion?

• Holoenzyme

• Apoenzyme

• Coenzyme

• Substrate

What is the first digit in an enzyme's classification number based on?

• The type of reaction it catalyzes

• The name of the enzyme

• The size of the enzyme

• The enzyme's molecular weight

What is the role of coenzymes?

• They permanently bind to the enzyme

• They act as transient carriers of specific chemical groups

• They form the main structure of the enzyme

• They act as inhibitors of enzymatic activity

Which vitamin is the precursor for Nicotinamide Adenine Dinucleotide (NAD)?

• Vitamin B1

• Vitamin B2

• Vitamin B3

• Vitamin B6

What type of biomolecule are most enzymes composed of?

• Carbohydrates

• Proteins

• Lipids

• Nucleic acids

Which enzyme class catalyzes oxidation-reduction reactions?

• Hydrolases

• Transferases

• Oxidoreductases

• Isomerases

Which model suggests that the enzyme's active site changes shape to fit the substrate?

• Lock-and-key model

• Induced fit model

• Transition state model

• Conformational model

What is the function of lyases?

• Catalyze hydrolysis reactions

• Remove or add groups to double bonds

• Transfer functional groups

• Convert a substrate into its isomer

What is the active site of an enzyme?

• The entire enzyme structure

• The region where substrates bind and catalysis occurs

• The non-functional region of the enzyme

• The part of the enzyme that inhibits reactions

Which enzyme specificity type refers to an enzyme acting on only one specific substrate?

• Linkage specificity

• Stereochemical specificity

• Group specificity

• Absolute specificity