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    I believe HIV viruses definitely have a capsid, enzymes and RNA but no cell wall. Bacterium definitely have a cell wall and a capsid\capsule but I don't think they have RNA or enzymes (someone please correct me if I'm wrong as this isn't covered in my spec)

    For the second part, I'd give something along the lines of: HIV DNA acts as the template stand. DNA polymerase catalyses the addition of free nucleotides to the newly formed DNA stand (the coding strand) in the 5' to 3' direction by following the complementary base pair rules. A pairs with T using 2 hydrogen bonds and C pairs with G using 3 hydrogen bonds. A purine pairs with a pyramidine

    For the second part, say 3 of the 4 differences:
    DNA has deoxyribose (mRNA has ribose)
    DNA is double stranded (mRNA single stranded)
    DNA has thymine whereas mRNA has thymine replaced with uracil
    DNA is a larger molecule than mRNA

    Hope this helps
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