Describe the main role of the molecule, DNA.
State one nucleic acid; DNA, or RNA, which never leaves the nucleus in a eukaryotic cell. Ignore the events of the stages of mitosis.
The presence of nucleotides has been put forward as a definition of whether an entity constitutes a form of ‘life’. Name the three main components of all nucleotides.
Figure 1 shows the way in which nucleotides join together to form the backbone of the DNA double helix.
Figure 2
Name the bond that joins the nucleotides together to form this backbone. The bond is labelled as bond X in Figure 1.
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