Booklet A Flashcards
Define control
A control variable is one which may affect the outcome of the investigation. You should keep these variables constant
Define dependent..
The value you measure for each and every independent variable change
Define independent
The variable for which value are changed or selected by the investigator
Define accuracy
An accurate measurement is one which is close to the true value
define Reliability
The results are reliable if they can be repeated.
Define averages…
An average of repeated measurements helps to give a more accurate value for the variable being measured. ( Add up the measurements recorded and divide by the number of measurements taken)
What is an enzyme?
A biological catalyst that speeds up reactions without being used in the reaction itself
What 3 factors affect how they work?
- pH
- Temperature
- Enzyme concentration
What doe high temperatures do to enzymes?
Enzymes are progressively denatured- changes shape of the active site and it no longer fits the substrate
What does the tight fit between substrate and enzyme enable?
Enables the enzyme to catalyse the reaction and split the substrate into its products
What is the action of enzymes referred to as lock and key?
Due to the importance of the tight fit between the enzymes active site and the substrate
What is enzyme specificity
Each enzyme is specific in that it will only work on one( or small range of) substrate
