AQA GCSE Biology paper 1
Magnification equation - Correct Answers-Magnification= image size/actual object size
Light microscope- how many um in 1 mm - Correct Answers-1000 um
light microscope- how many nm in 1 um - Correct Answers-1000 nm
Light microscope- why can we see the nucleus and cell wall but not the mitochondria - Correct
Answers-Too small and not stained
light microscope- how can we see smaller parts of cells - Correct Answers-An electron
microscope has much more resolution and magnification
What is osmosis? - Correct 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 - Correct Answers-Something that dissolves in water
Investigating osmosis- what are the results - Correct 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 - Correct Answers-Amount of solution
Investigating osmosis- why should you remove excess water with paper towels before weighing
- Correct 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 - Correct Answers-Add iodine to substance. Turns black if starch
present
How to test for protein - Correct Answers-Add biuret. Turns purple
How to test for reducing sugar - Correct Answers-Add benedicts and heat for 2 mins. Turns red
How to test for lipid - Correct Answers-Add ethanol then add water. Turns cloudy
Investigating amylase enzyme- why do you need a water bath - Correct 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 - Correct 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 - Correct Answers-Measuring,
starting and stopping timers
Light and photosynthesis results - Correct Answers-The closer the lamp, the quicker the bubbles
are produced, so higher rate of photosynthesis
Light and photosynthesis- why might results be inaccurate - Correct 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 - Correct 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 -
Correct 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 - Correct Answers-The plant also needs
enough temperature and co2
Investigating reaction time- why do you have to repeat - Correct Answers-So you can calculate
the mean, range of results, resolution of measurements
Measuring population size- what apparatus should you use - Correct Answers-A quadrat
What is a cell membrane important for - Correct Answers-Determines what goes in and out of
the cell
What is a cell wall important for - Correct Answers-Structure
What is the facile important for - Correct Answers-Structure
Magnification equation - Correct Answers-Magnification= image size/actual object size
Light microscope- how many um in 1 mm - Correct Answers-1000 um
light microscope- how many nm in 1 um - Correct Answers-1000 nm
Light microscope- why can we see the nucleus and cell wall but not the mitochondria - Correct
Answers-Too small and not stained
light microscope- how can we see smaller parts of cells - Correct Answers-An electron
microscope has much more resolution and magnification
What is osmosis? - Correct 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 - Correct Answers-Something that dissolves in water
Investigating osmosis- what are the results - Correct 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 - Correct Answers-Amount of solution
Investigating osmosis- why should you remove excess water with paper towels before weighing
- Correct 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 - Correct Answers-Add iodine to substance. Turns black if starch
present
How to test for protein - Correct Answers-Add biuret. Turns purple
How to test for reducing sugar - Correct Answers-Add benedicts and heat for 2 mins. Turns red
How to test for lipid - Correct Answers-Add ethanol then add water. Turns cloudy
Investigating amylase enzyme- why do you need a water bath - Correct 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 - Correct 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 - Correct Answers-Measuring,
starting and stopping timers
Light and photosynthesis results - Correct Answers-The closer the lamp, the quicker the bubbles
are produced, so higher rate of photosynthesis
Light and photosynthesis- why might results be inaccurate - Correct 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 - Correct 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 -
Correct 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 - Correct Answers-The plant also needs
enough temperature and co2
Investigating reaction time- why do you have to repeat - Correct Answers-So you can calculate
the mean, range of results, resolution of measurements
Measuring population size- what apparatus should you use - Correct Answers-A quadrat
What is a cell membrane important for - Correct Answers-Determines what goes in and out of
the cell
What is a cell wall important for - Correct Answers-Structure
What is the facile important for - Correct Answers-Structure
