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Pearson Edexcel Level 3 GCE Biology A (Salters Nuffield) Advanced Subsidiary PAPER 2: Development, Plants and the Environment mark scheme result november-2021

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pearson-edexcel-gce-question-booklet-mark-scheme-result-november-2021-in-biology-a-salters-nuffield-8bn0-paper-2-development-plants-and-the-environment Answer ALL questions. Write your answers in th... e spaces provided. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 An electron microscope can be used to identify organelles in eukaryotic cells. (a) The photograph shows part of a eukaryotic cell. (i) Label the nucleolus on the photograph. (1) (Source: AL1379899 – Jose Luis Calvo / Shutterstock / PAL) (ii) The nucleolus is not found in prokaryotic cells because they (1) A do not contain DNA B do not have a nucleus C only contain RNA D only contain single-stranded DNA (iii) Explain why the nucleus cannot be observed at the end of prophase in a eukaryotic cell The only correct answer is – B prokaryotic cells do not have a nucleus A is incorrect because prokaryotic cells do contain DNA C is incorrect because prokaryotic cells do not only contain RNA D is incorrect because prokaryotic cells do not only contain single-stranded DNA (1 [Show More]

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