A-LevelBiologyCell membranes and transportFeb/Mar 2021Paper 1 Q171 Mark
When living pancreatic cells were placed in a solution of a red stain called neutral red, the cytoplasm became red. The cells were then removed from the solution of neutral red. The red stain in the cytoplasm moved into vesicles, which were exported from the cell, eventually leaving the cell colourless. Which transport mechanisms could explain how the red stain entered and left the cells?
Aactive transport and facilitated diffusion
Bdiffusion and exocytosis
Cfacilitated diffusion and endocytosis
Dosmosis and exocytosis
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The correct answer is B. This question tests the candidate's understanding of cell membranes and transport within the Biologysyllabus. The examiner's mark scheme requires...
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