30 Questions
What are the general properties of enzymes?
They remain unchanged during a chemical reaction
What is the definition of an enzyme?
A substance that increases the rate of a chemical reaction without being changed itself
What do enzymes end in, according to the text?
-ase
Which suffix is added to the substrate of the reaction to name an enzyme?
-ase
What is a catalyst?
A substance that increases the rate of a chemical reaction without being changed itself
Why are enzymes needed in small amounts?
Because they can be reused multiple times
What is the role of a coenzyme in enzyme function?
To transiently associate with the enzyme
Which class of enzymes catalyze the transfer of electrons or oxygen?
Oxidoreductases
What is the function of hydrolases?
Catalyze the hydrolysis of a substrate by adding H2O
What is the role of ligases in enzymatic reactions?
Catalyze joining of two substrates using ATP as an energy source
What is the function of isomerases?
Catalyze geometric or structural changes within the molecule
How do enzymes accelerate the rate of a reaction?
By providing an alternate reaction pathway with a lower energy of activation
What is the active site of an enzyme?
A pocket formed by folding of the protein, containing amino acid side chains that participate in the reaction
What does the term 'holoenzyme' refer to?
The combination of an apoenzyme and its cofactor/coenzyme
Which term is used to describe a substance that increases the rate of a chemical reaction without being itself changed in the process?
Catalyst
What is the nomenclature rule for naming enzymes?
Adding suffix (ose) to the substrate of the reaction
Which property of enzymes distinguishes them from other biological molecules?
They increase the rate of chemical reactions
What is the primary composition of enzymes?
Proteins only
Which term describes a substance that decreases the rate of a chemical reaction?
Inhibitor
What is the purpose of adding suffix (ase) to a word in enzyme nomenclature?
Describes the action performed by the enzyme
What is the role of oxidoreductases?
Catalyze the transfer of electrons or oxygen
What is the function of isomerases?
Catalyze structural changes within the molecule
What is the function of hydrolases?
Catalyze the hydrolysis of a substrate
What do ligases catalyze in enzymatic reactions?
Catalyze joining of two substrates using ATP as an energy source
What is the active site of an enzyme?
A special pocket or cleft formed by folding of the protein
What is a coenzyme associated with enzymes?
Tightly bound small organic molecule
What is the effect of an enzyme on the energy barrier in a chemical reaction?
Lower the free activation energy
What is a characteristic of lyases in enzymatic reactions?
Catalyze simple splitting of the substrate without adding water
What do transferases catalyze in enzymatic reactions?
The transfer of a chemical group other than hydrogen or oxygen from one substance to another
What is the purpose of cofactors in enzymatic reactions?
To aid enzymes by acting as coenzymes or metal ions
Test your knowledge on enzymes in the context of physical therapy. This quiz covers topics such as enzyme structure, properties, mechanisms of action, factors affecting activity, types of inhibitors, and clinical applications in diagnosing diseases.
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