17 Questions
Which of the following is the correct way to name an enzyme?
Add the suffix '-ase' to the end of the substrate name
What is the main mechanism by which enzymes catalyze reactions?
Enzymes decrease the activation energy of the reaction
Which of the following is an example of an enzyme class?
Protease
What type of reaction does alcohol dehydrogenase catalyze?
Oxidation-reduction
Which of the following is a characteristic of allosteric enzymes?
They have more than one binding site
What is the purpose of enzyme immobilization?
To restrict enzyme mobility in a fixed space
What is the term used to describe RNA molecules that have catalytic activity?
Ribozymes
What is a holoenzyme composed of?
Apoenzyme + Cofactor
What are examples of non-protein cofactors for enzymes?
Vitamins
What is the region in an enzyme that targets a specific biochemical reaction due to its molecular conformation?
Active Site
Which effect describes the enzyme holding substrates in close proximity to each other and the enzyme's active site?
Proximity Effect
What term is used for enzymes that occur in several different molecular forms but catalyze the same reaction?
Isozymes
What is the primary purpose of enzyme classification?
To organize enzymes based on the reactions they catalyze
What is the key characteristic of a catalyst as described in the text?
A catalyst provides an alternative pathway with lower activation energy
Which of the following is an example of an enzyme-catalyzed reaction given in the text?
$ATP + L-tyrosine + tRNA_{Tyr} = AMP + diphosphate + L-tyrosyl-tRNA_{Tyr}$
What is the primary purpose of enzyme nomenclature as described in the text?
To name and number enzymes in a standardized way
What is the key characteristic that defines the six major classes of enzymes?
The type of chemical reaction the enzyme catalyzes
Explore the history of enzyme classification, from the International Classification Commission in 1864 to the Enzyme Nomenclature in 1992. Learn about how enzymes are classified based on the reactions they catalyze and the extensive work done by the Commission on Enzymes of the International Union of Biochemistry.
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