An image of a cell is 60 mm long. The real length of the cell is 0.0025 mm. Calculate the magnification.
From Paper 1, Higher
36 marks
Describe a method to investigate the effect of pH on the rate of reaction of amylase.
From Paper 1, Higher
43 marks
A potato cylinder had a mass of 1.85 g. After 30 minutes in a sugar solution its mass was 1.85 g. Calculate the percentage change in mass and explain what this shows.
From Paper 1, Higher
143 marks
A root hair cell is specialised for absorbing water and mineral ions. Explain two adaptations.
From Paper 1, Higher
153 marks
Explain why electron microscopes have increased our understanding of sub-cellular structures.
From Paper 1, Higher
161 mark
Which enzyme breaks down lipids?
From Paper 1, Higher
173 marks
Explain how active transport differs from diffusion.
From Paper 1, Higher
271 mark
What is the function of ribosomes?
From Paper 1, Higher
284 marks
Describe how to prepare a slide of onion epidermis cells and view it with a light microscope.
From Paper 1, Higher
292 marks
Explain the lock-and-key model of enzyme action.
From Paper 1, Higher
304 marks
Explain how the structure of alveoli makes gas exchange efficient.
From Paper 2, Higher
94 marks
Describe the food tests for starch, sugars and protein.
From Paper 2, Higher
204 marks
Describe where carbohydrases, proteases and lipases are produced in the digestive system, and name the products of their digestion.
From Paper 2, Higher
311 mark
Which organ produces bile?
Score 0 / 44 · 0 of 15 marked
This paper is written by Plasmo in the style of the Edexcel GCSE Biology exam. It is not a past paper and is not produced or endorsed by the exam board.