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Term 4 2b

How enzymes work

QuestionAnswer
It is the ................ structure that determines the structure of a ..............? Tertiary structure that determines the structure of a protein.
The folding of an ......... into its ................ ............ creates a specific ........... on it's .........., into which a ............... can fit, just like the pieces of a jigsaw puzzle. the folding of an enzyme into its tertiary structure creates a specific shape on it's surface, into which a substrate can fit, just like the pieces of a jigsaw puzzle.
What is an active site? The part of the enzyme that substrate molecules bind to.
How is an active site created? By the tertiary structure creating a specific shape.
What is a substrate? A substance being acted on
What happens when an enzyme controlled reaction takes place? the enzyme and substrate molecules become joined together for a short period of time.
What happens when the enzyme and the substrate molecules join together? They form an enzyme substrate complex
The .......... molecules then .......... together and the ..... product leaves the .........? The substrate molecules then react together and the end product leaves the enzyme.
The enzyme is ............ by the reaction and can be .......... again? Unchanged by the reaction and can be used again.
Because of its ......... shape, an enzyme can only act on one type of ............. ........ which makes it .......... much .......... than it normally would. Because of its specific shape, an enzyme can only act on one type of chemical reaction which makes it proceed much faster than it normally would.
When cells are exposed to ..... ............. or environments that are ........ or ........ acidic than normal, they ....... to .........? When cells are exposed to high temperatures or environments that are more or less acidic than normal, they cease to function.
Why do they cease to function when they are exposed to high temperatures or unusual pH levels? Because the protein in the cell changes its 3-dimensional shape.
What is the change in shape, caused by environmental factors called? denaturation
If the change is minor, the protein can ........ to its ......... ......... If the change in minor, the protein can return to its original shape.
If the change is major (hydrogen bonds between the connecting units of amino acids have been broken), the protein is destroyed and ........ .......... to its ........ ......? The protein is destroyed and can't return to its original shape.
Enzymes generally ......... very ...........? Enzymes generally work very rapidly.
Enzymes are not ........... by the ..........., they ......... .up and can be .......... ........? Enzymes are not destroyed by the reactions, they speed up and can be used again.
Enzymes are usually .......... to ............ ..........? Enzymes are usually specific to particular reactions.
Enzymes can ...... in either ............? Enzymes can work in either direction.
Created by: zarap103