Bio f4 chap 5 Flashcards
What will happen if ribosomes in a pancreas cell do not function?
- trypsin is not synthesised
- protein digestion is slower
Why must our body temperature be maintained at 37°C?
- the optimal temperature of enzymes is 37°C
What is the purpose of wrapping meat with papaya leaves?
- enzyme called papain
- breaks down protein
- soften the meat
- tenderise the meat
Why are apples that have been boiled after they are peeled, do not change colour to brown?
- apple contain a type of enzyme that transforms the colour of apple tissue to brown
- enzyme becomes denatured (apple won’t turn brown)
Explain the use of enzymes to extract agar-agar from seaweed.
- cellulase
- breaks down the cell wall of seaweed and separates the agar-agar from it
Function of lipase in the food industry
- cheese
Suggest an enzyme that you can use to process meat and fish. State the function of this enzyme.
- protease
- tenderise meat
- separate fish meat from its skin
How the characteristics of the enzymes can influence its action.
i) sensitive to temperature
- functions optimally within a certain temperature range
- too high, protein structure in enzyme will be denatured
- too low, enzyme becomes less active
ii) sensitive to changes in pH
- certain range of pH value
- pepsin (1.5 - 2)
iii) specific
- only substrate molecules that can complement the enzyme molecule will bind to it so that reaction can take place
Why the enzymes that exist in the bacteria strain which live in hot spring areas can be extracted and added to laundry detergent?
- washing machine has temperature control
- high temperature can cause the enzymes to denature
- enzymes are able to withstand high temperatures without denaturing
Why does cyanide poisoning cause immediate death?
- can bind with one of the cellular respiration enzymes
- block glucose oxidation and stop cellular respiration
- without respiration, a person will die
