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DNA Structure

DNA Structure. Unit 2-1 Notes Mr. Hefti – Pulaski Biology. What are these?. What is this?. [similar in shape]. How are they related?. What is this?. What is this?. How are they related?. [both contain instructions]. A. DNA = blueprint for life. All living things possess DNA

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DNA Structure

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  1. DNA Structure Unit 2-1 Notes Mr. Hefti – Pulaski Biology

  2. What are these? What is this? [similar in shape] How are they related?

  3. What is this? What is this? How are they related? [both contain instructions]

  4. A. DNA = blueprint for life • All living things possess DNA • Located in the nucleus • Chemical instructions for structure and function • Unique code tellscells what to do

  5. B. DNA is a “double helix” • Think - twisted ladder • There’s a left and right side chemically bonded together in the middle • Held together by hydrogen bonds

  6. C. DNA made of repeating units called nucleotides • Here are the 3 parts of a nucleotide: (please draw in notes)

  7. D. Phosphate • Made of H, O and P • Phosphate links nucleotides together

  8. E. Deoxyribose sugar • 5 carbon sugar (pentagon shaped) • Made of C, H and O • Deoxyriboselinks phosphate and nitrogenous base

  9. F. Nitrogenous base • Made up of C, H, O and N • Form rungs of ladder • 4 types: • Adenine (A) • Thymine (T) • Guanine (G) • Cytosine (C)

  10. G. Base-pairing rules • A always pairs with T • C always pairs with G

  11. H. In conclusion… • The combination of As, Ts, Cs, and Gs is what makes each organism unique • Human DNA composed of 3 billion repetitions of those same 4 letters

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