Ensyymit

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    What are enzymes?

    Catalysts that lower activation energy for biochemical reactions.

    How do enzymes differ from non-catalyzed reactions?

    Enzymes significantly speed up reactions that would otherwise occur very slowly.

    What is a substrate?

    The molecule that an enzyme acts upon.

    What is the active site of an enzyme?

    The region where the substrate binds to the enzyme.

    What happens to enzymes during reactions?

    They remain unchanged and are not consumed.

    What are cofactors?

    Non-protein molecules required for enzyme activity.

    What is a coenzyme?

    An organic cofactor that temporarily binds to an enzyme.

    What is an apoenzyme?

    An inactive enzyme without its cofactor.

    What is a holoenzyme?

    An active enzyme with its cofactor bound.

    What are isoenzymes?

    Enzymes that catalyze the same reaction but differ in structure and properties.

    How do hexokinase I and IV differ?

    Hexokinase I has higher affinity for glucose than hexokinase IV.

    What is the significance of the Michaelis-Menten constant (Km)?

    It indicates the substrate concentration at which the reaction rate is half its maximum.

    What is the role of the enzyme commission number (EC number)?

    It classifies enzymes based on the reactions they catalyze.

    What is the unit of enzyme activity?

    The katal, defined as the amount of enzyme converting one mole of substrate per second.

    What is the alternative unit for measuring enzyme activity?

    Unit (U), which measures micromoles of substrate converted per minute.