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DNA Structure

DNA Structure. The Size of DNA. If the DNA of one cell is stretched out, it makes a 7 ft. long string. There are about 5 trillion cells in the human body. If you connected all the DNA together, it would be long enough that I t would take light over 10 hours to travel its length.

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DNA Structure

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  1. DNA Structure

  2. The Size of DNA... • If the DNA of one cell is stretched out, • it makes a 7 ft. long string • There are about 5 trillion cells in the human body • If you connected all the DNA together, it would be long enough that • It would take light over 10 hours to travel its length

  3. DNA Structure • DNA consists of two molecules that are arranged into a ladder-like structure called a Double Helix. • A molecule of DNA is made up of millions of tiny subunits called Nucleotides. • Each nucleotide consists of: • Phosphate group • Pentose sugar • Nitrogenous base

  4. Nucleotides Phosphate Nitrogenous Base Pentose Sugar

  5. Nucleotides • The phosphate and sugar form the backbone of the DNA molecule, whereas the bases form the “rungs”. • There are four types of nitrogenous bases.

  6. Nucleotides A T C Adenine Thymine G Guanine Cytosine

  7. Nucleotides • Each base will only bond with one other specific base. • Adenine (A) • Thymine (T) • Cytosine (C) • Guanine (G) Form a base pair. Form a base pair.

  8. DNA Structure • Because of this complementary base pairing, the order of the bases in one strand determines the order of the bases in the other strand.

  9. A T A A A T T T C C C G G G

  10. DNA Structure • To crack the genetic code found in DNA we need to look at the sequence of bases. • The bases are arranged in triplets called codons. A G G - C T C - A A G - T C C - T A G T C C - G A G - T T C - A G G - A T C

  11. DNA Structure • A gene is a section of DNA that codes for a protein. • Each unique gene has a unique sequence of bases. • This unique sequence of bases will code for the production of a unique protein. • It is these proteins and combination of proteins that give us a unique phenotype.

  12. DNA Gene Protein Trait

  13. Your Task • Draw a flow chart to show how to get from:

  14. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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