Explain why muscle cells contain many mitochondria.
From Paper 3, Higher
22 marks
Convert 0.025 mm into micrometres and explain why micrometres are used for cells.
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33 marks
Explain why the stomach contains hydrochloric acid.
From Paper 3, Higher
43 marks
Explain why heart rate and breathing rate increase during exercise.
From Paper 3, Higher
53 marks
Explain why greenhouse growers increase carbon dioxide concentration and temperature.
From Paper 3, Higher
123 marks
Explain why bacterial cells can divide very rapidly and calculate how many bacteria there will be after 2 hours if one cell divides every 20 minutes.
From Paper 3, Higher
133 marks
Explain the difference between magnification and resolution.
From Paper 3, Higher
142 marks
Explain why different enzymes are needed to digest starch and protein.
From Paper 3, Higher
152 marks
State two uses of anaerobic respiration in yeast by humans.
From Paper 3, Higher
161 mark
In which part of a leaf cell does photosynthesis happen?
From Paper 3, Higher
234 marks
Describe how to prepare an uncontaminated culture of bacteria on an agar plate.
From Paper 3, Higher
242 marks
A mitochondrion is 2 μm long. Write this in metres in standard form.
From Paper 3, Higher
303 marks
A clear zone around an antibiotic disc has a diameter of 12 mm. Another antibiotic gives a clear zone of diameter 6 mm. Calculate the area of the larger clear zone and state which antibiotic is more effective.
From Paper 3, Higher
331 mark
What is the function of the cell wall in a plant cell?
From Paper 3, Higher
341 mark
Which structure is found in plant cells but not animal cells?
Score 0 / 35 · 0 of 15 marked
This paper is written by Plasmo in the style of the OCR GCSE Biology exam. It is not a past paper and is not produced or endorsed by the exam board.
Cell level systems Exam Questions: OCR GCSE Biology | Plasmo