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    Biology A (Salters-Nuffield) A-Level

    Double membrane envelope

    What Double membrane envelope means in Biology A (Salters-Nuffield) A-Level, as defined for Pearson Edexcel.

    Definition of Double membrane envelope

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    Reference: Pearson Edexcel

    The envelope that encloses the organelle and controls the movement of substances into and out of the chloroplast.
    Pearson Edexcel · Topic 5: On the Wild Side

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