AS Paper 1 Practise Questions Flashcards
- Questions that I have attempted before and gotten wrong (17 cards)
Which component of the membrane can affect its fluidity - 1mark
Lipids, e.g. cholesteral
Which adaptations would allow a gaint water lily to survive in a watery enviroment - 1 mark
Stomata on the surface level only
What is the correct order of cytokinesis, g1, g2, mitosis and s - 1 mark
G2, Mitosis, Cytokinisis, G1, S
Explain the difference between a potato that had been boiled and one that had not, and the impact on water movement - 2 marks
Boiling damages the cell surface membrane
So there is no osmosis out of the cell
Where as the other cell would have osmosis in and out the cell
What would the graph of enzyme rate with a non competive inhibitor look like - 1 mark
Would increase a tiny bit and then plato completely straight
What would happen to the movement of water in a potato soaked in ethanol vs soaked in water - 2 marks
Ethanol dissolves the phospholipid bilayer
Therefore there is no osmosis or movement of water
Movement of water would occur like normal in the other potato
How could a student reduce the uncertainty of their data in an experiment - 1 mark
Use more precise apparatus
Describe how a colorimeter is calibrated - 1 mark
Set to zero absorbance using distilled water
Why is it important to calibrate a colorimeter - 1 mark
So that all are measured to the same standard and are compareable
Image Q is in metaphase, describe what is happening - 2 mark
Chromosomes are aligning on equator
Spindle fibres attach to chromosome
What are the tubes the connect xylem vessels called - 1 mark
Bordered pits
Explain why mosses do not need structure such as xylem to survive - 1 mark
They have a large surface area to volume ratio
Name the covalent bond between two cysteine amino acids - 1 maark
Disulfide
Name the molecule that is found within the cell walls of bacterial cells - 1 mark
Peptidoglycan
Suggest the chemical bond that lysosome breaks and name the molecule that is needed for this reaction - 2 marks
Glycosidic and water
Explain why enzymes at a higher temperature have a different graph shape to those a optimum temperature - 2 marks
At a higher temperature there is more kinetic energy, so intitial rate is faster, however enzymes are eventually denatured
Explain why enzymes at a lower temperature have a different graph shape compared to those at optimum temperature - 2 marks
At lower temperature there is less kinetic energy, so rate of reaction is much slower and not all of the substrate is reacted
