turning the key to open a lock is which change physical or chemical
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An active site can be thought of as a lock and the substrate as a key; this is known as the lock and key model. A key (substrate) must be inserted and turned (chemical reaction), then the lock (enzyme) opens (production of products).
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TURNING THE KEY TO OPEN THE LOCK IS THE PHYSICAL CHANGE WHY BECAUSE THE CHANGE CAN BE REVERSIBLE
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