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HKDSE BIOLOGY: Connecting ConceptsChapter 2Question bankShort questionsShort questions|!|BCESC0020000001|!|The diagram below shows the molecular structure of a part of a DNA molecule.(a)Identify the components X, Y and Z.(3 marks)(b)Name the basic units which make up a DNA molecule.(1 mark)(c)What are the bonds labelled A? How is this type of bond important to DNAmolecules?(2 marks)##YYXXZAguanine