AQA GCSE Biology paper 1 latest complete test A+
Magnification equation - answers Magnification= image size/actual object size
Light microscope- how many um in 1 mm - answers 1000 um
light microscope- how many nm in 1 um - answers 1000 nm
Light microscope- why...
Light microscope- how many um in 1 mm - answers 1000 um
light microscope- how many nm in 1 um - answers 1000 nm
Light microscope- why can we see the nucleus and cell wall but not the mitochondria -
answers Too small and not stained
light microscope- how can we see smaller parts of cells - answers An electron
microscope has much more resolution and magnification
What is osmosis? - answers The movement of water from an area with high
concentration of water to an area of low concentration of water
What's a solute - answers Something that dissolves in water
Investigating osmosis- what are the results - answers High concentration of sugar in
solution- water moves out of potato cells into the solution.potato gets smaller, low
concentration potato gets bigger
Control variables of investigating osmosis - answers Amount of solution
Investigating osmosis- why should you remove excess water with paper towels before
weighing - answers to ensure that any change in the mass of the potato is due to a
change in the water content inside the potato cells
How do you test for starch - answers Add iodine to substance. Turns black if starch
present
How to test for protein - answers Add biuret. Turns purple
, How to test for reducing sugar - answers Add benedicts and heat for 2 mins. Turns red
How to test for lipid - answers Add ethanol then add water. Turns cloudy
Investigating amylase enzyme- why do you need a water bath - answers To maintain
the correct temperature, because temperature affects reaction rate
Investigating amylase enzyme- if you text at ph 3,4,5,6,7,8,9&10 why don't we know the
exact optimum ph - answers Because all though two answers may both show quick
reactions, the actual optimum could be between those numbers so you need to test
different phs to find exact optimum
Investigating amylase enzyme- sources of error and weaknesses - answers Measuring,
starting and stopping timers
Light and photosynthesis results - answers The closer the lamp, the quicker the
bubbles are produced, so higher rate of photosynthesis
Light and photosynthesis- why might results be inaccurate - answers Difficult to count
very small bubbles each bubbles count as 1 no matter how big it is
Light and photosynthesis- why should you leave the plant for a few minutes before
starting to count bubbles - answers It takes time for the plant to adjust to the
light/temperature and for photosynthesis to reach the correct rate
Light and photosynthesis- heat from the lamp is a source of error, how could you avoid
this - answers Place a glass screen in front of beaker do the light gets through but the
heat doesn't
Light and photosynthesis- what are the other limiting factors apart from light? Why will
rate of photosynthesis level off, even with maximum light - answers The plant also
needs enough temperature and co2
Investigating reaction time- why do you have to repeat - answers So you can calculate
the mean, range of results, resolution of measurements
Measuring population size- what apparatus should you use - answers A quadrat
What is a cell membrane important for - answers Determines what goes in and out of
the cell
What is a cell wall important for - answers Structure
What is the facile important for - answers Structure
What happens at the cytoplasm - answers Reactions
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