DNA

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Cut a piece of paper into 1cm strips.
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Here are the strips.
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Cut the strips into 3cm lengths.
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Take about fifteen strips and cool ur one half of both sides blue. Folding in half then unfolding helps.
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Here they are.
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Colour the other half of those fifteen strips yellow on both sides.
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Now do the same with another fifteen, but this time colouring them red …
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… and green.
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Now cut two 70 cm lengths of masking tape and secure them sticky side up to a table using a small piece of masking tape at each end of each piece. Leave a gap of 2cm between them, and make sure they are parallel.
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Here they are.
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Now carefully place the strips across the gap between the two lengths of tape, so that a little of each end of the strip sticks to the tape. Leave about 1 cm between the strips.
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Continue all the way along your lengths of tape, arranging the strips randomly.
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Cut the ends off the lengths of tape, to release them from the table.
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Now carefully fold one length of tape back on itself, so that it covers the ends of the paper strips and sticks to itself.
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Continue along the entire length …
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… and repeat for the other strip.
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Now cut along the length of one piece of tape, so that only about 0.5cm remains.
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Do the same to the other length of tape.
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Your DNA molecule is finished, but it needs a twist. Tape one end to the table, hold the other end and gently turn your hand anticlockwise – this will give the molecule the correct twist.
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The molecule has a ‘right-handed’ screw.
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You could make several lengths of your molecule and stick them together, then hang them up as decorations. Make sure they have a right-handed screw twist.
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Your DNA double helix.

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