1 / 73


DNA. The Secret of Life. Deoxyribonucleic Acid. DNA is the molecule responsible for controlling the activities of the cell It is the hereditary molecule DNA directs the production of protein. Structure of DNA.

Download Presentation


An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.


Presentation Transcript

  1. DNA The Secret of Life

  2. Deoxyribonucleic Acid • DNA is the molecule responsible for controlling the activities of the cell • It is the hereditary molecule • DNA directs the production of protein

  3. Structure of DNA • In 1953, Watson and Crick proposed that DNA is made of two chains of nucleotides held together by nitrogenous bases. • Watson and Crick also proposed that DNA is shaped like a long zipper that is twisted into a coil like a spring.

  4. Structure of DNA • Because DNA is composed of two strands twisted together, its shape is called double helix. • A double helix resembles a twisted ladder.

  5. Nucleotides • DNA is made up of subunits called nucleotides • Nucleotides consist of the backbone, which is made of sugar (deoxyribose) and phosphate, as well as a nitrogenous base

  6. Nucleotide Nitrogen base Phosphate Sugar

  7. How Did DNA Get its Name? • Based on what you just learned, how do you think deoxyribonucleic acid (DNA) got its name?

  8. Nucleotides • A nitrogenous base is a carbon ring structure that contains one or more atoms of nitrogen. • In DNA, there are four possible nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Cytosine (C) Guanine (G) Thymine (T) Adenine (A)

  9. Nucleotide Sequence • The four nucleotides are represented by the first letter in their name • A – Adenine • G – Guanine • T – Thymine • C – Cytosine

  10. Nucleotide Sequence • In DNA, Adenine always pairs with Thymine • Cytosine always pairs with Guanine

  11. Nucleotides • Nucleotides stack on top of one another forming the double helix, or twisted ladder

  12. DNA Building • Click here to link to a DNA building activity online!

  13. Go Get It Moment! • When you hear “Move it!” you will have 30 seconds to come get one piece of paper with an A, G, T, or C on it. • Then find someone else in the room whose letter correctly matches with your nucleotide letter and stand by that person. • What are the questions? • “Move it!”

  14. 30 seconds

  15. 20 seconds

  16. 10 seconds

  17. 9 seconds

  18. 8 seconds

  19. 7 seconds

  20. 6 seconds

  21. 5 seconds

  22. 4 seconds

  23. 3 seconds

  24. 2 seconds

  25. 1 seconds

  26. Let's get started!

  27. Go Get It Moment! • When you hear “Double Helix”, you will have 1 minute to make a classroom DNA strand by standing next to another pair of nucleotides • What questions are there? • “Double Helix”

  28. 1 minute

  29. 50 seconds

  30. 40 seconds

  31. 30 seconds

  32. 20 seconds

  33. 10 seconds

  34. 9 seconds

  35. 8 seconds

  36. 7 seconds

  37. 6 seconds

  38. 5 seconds

  39. 4 seconds

  40. 3 seconds

  41. 2 seconds

  42. 1 seconds

  43. Let's get started!

  44. DNA Replication • In order for cells to divide, DNA must be able to make exact copies of itself • This process is known as DNA Replication

  45. DNA Replication • DNA Replication occurs before mitosis and meiosis • Replication results in two identical DNA daughter strands from one mother strand

  46. Process of DNA Replication • The DNA strand is unzipped at the hydrogen bonds by an enzyme named helicase. • Nucleotides in the nucleus then find their corresponding nucleotides on each of the two open DNA strands and produce two new DNA double helixes.

  47. Link to DNA Replication Animation • Click here to see how DNA Replication works

  48. Protein Synthesis • The main job for DNA is to direct the production of protein • Protein makes tissues and organs and carries out the organism’s metabolism • Proteins are polymers (chains) of amino acids

  49. Protein Synthesis • The sequence of nucleotides in each gene contains information for assembling the string of amino acids that make up a single protein

More Related