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Enzymes are large [globular] proteins that [catalyse] anabolic ([building] up) or catalytic ([breaking] down) reactions. Enzymes are [soluble] proteins due to their hydrophilic groups. Enzymes have an [active site] which is where the substrate binds. When the substrate binds the active site changes shape to complete the fit - this is called the '[induced] fit model'. When this happens an enzyme substrate [complex] is formed. Enzymes are highly [specific] and only the [complimentary] substrate fits the active site.  The shape of the active site is determined by the [tertiary] structure of the enzyme. Different enzymes have different tertiary structures. The structure of an enzyme can be altered by [pH] and [temperature].  The [activation] [energy] is the energy needed to start a reaction..

Enzyme key characteristics

by Jmullinger

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