Biology 7401: Organisms Exchange Substances With Their Environment Topical Past Paper Questions
AQA AS Biology (7401) past-paper questions on Organisms Exchange Substances With Their Environment, free. This topic is frequently examined across 9 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
Describe the role of haemoglobin (Hb) in the loading, transport and unloading of oxygen. [5 marks] Describe how a polypeptide is produced by translation of mRNA. [5 marks]
Scientists dissected gills from several species of fish. They recorded: • the mass of the whole fish • the total number of gill filaments - the mean length of one filament - the mean number of lamellae per mm - the mean surface area of one lamella. 1 It was not possible for the s…
1 Describe how the structure of the insect gas exchange system: • provides cells with sufficient oxygen • limits water loss. Explain your answers. [5 marks] Describe how humans breathe in and out. [5 marks]
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