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Term 4 2b
How enzymes work
Question | Answer |
---|---|
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. |