What do you know about dna
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What do you know about DNA?. Agree (A) or Disagree (D)?. DNA is found in all living things DNA is a small molecule All DNA molecules are the same DNA is what makes up genes The DNA of an organism can be changed You can live without DNA. Structure of DNA.

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Agree a or disagree d
Agree (A) or Disagree (D)?

  • DNA is found in all living things

  • DNA is a small molecule

  • All DNA molecules are the same

  • DNA is what makes up genes

  • The DNA of an organism can be changed

  • You can live without DNA


Structure of dna
Structure of DNA

  • Polymer made of monomerscalled nucleotides

  • 2 “backbones”: a sugar and a phosphate

  • Double helix shape

  • Nitrogen-containing bases:

    • A: Adenine

    • T: Thymine

    • C: Cytosine

    • G: Guanine


Bases come in 2 sizes
Bases come in 2 sizes

  • Purines: A and G

    • 2 rings

    • PUGA 2

  • Pyrimidines: T and C

    • 1 ring

  • A purine always bonds with a pyrimidine

    • Chargoff’s rule:

      • A and T

      • C and G


What does dna do
What Does DNA Do?

Stores information

  • Stays in nucleus

  • “Cookbook”

  • DNA is a HUGE molecule (3 BILLION base pairs in humans)

  • Information is used for making PROTEINS

    • Proteins regulate everything


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