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B2.3 dna


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B2.3 dna

  1. 1. How much DNA do we share with…? 60% 98% 21% 7%
  2. 2. DNA WALT: To understand the role and structure of DNA. WILF: ~ State what part of the cell where DNA is found. ~ Name the four bases that make up the DNA molecule. (D) ~ Describe how the DNA molecule is structured by complementary base pairing and weak hydrogen bonds. (C) ~ Explain the importance of DNA and how each gene codes for a particular protein. (B) ~ Evaluate the ethical issues relative to DNA. (A/A*)
  3. 3. So where is your DNA?
  4. 4. What is DNA? Genes contain instructions for specific proteins that are used in your body. One gene contains the instructions for one protein. e.g. eye colour, blood group, shape of your nose.
  5. 5. The structure of DNA Complementary base pairing: Adenine with thymine Cytosine with guanine These bases are held together by weak hydrogen bonds.
  6. 6. Making a DNA model • Choose four different colours (one for each base) • Colour in your bases. • Now cut out all your base pairs. Then fold along the dotted lines so they are ready to stick. • Cut out spines A and B. Stick your base pairs to one of the DNA spines so that one strand of your DNA molecule has bases in this order: AT GT C AT G G CT A G C • You might need to use paperclips to hold them on and help them stick. • Let the glue dry completely before you stick the base pairs to the other DNA strand.
  7. 7. What’s the question? 1.Nucleus 2.Double helix 3.Thymine 4.Weak Choose two of the answers and write a question to match that answer.