1 / 14

DNA

DNA. The code of life. DNA is described as a twisted ladder DNA is made up of Nitrogen Bases (rungs of the ladder) Phosphate and Sugar “backbone” Nitrogen Bases Nitrogen is an element of life! (Remember CHON?) There are 4 Bases: Adenine (A) Thymine (T) Cytosine (C) Guanine (G).

damara
Download Presentation

DNA

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.

E N D

Presentation Transcript

  1. DNA The code of life

  2. DNA is described as a twisted ladder • DNA is made up of • Nitrogen Bases (rungs of the ladder) • Phosphate and Sugar “backbone” • Nitrogen Bases • Nitrogen is an element of life! (Remember CHON?) • There are 4 Bases: • Adenine (A) • Thymine (T) • Cytosine (C) • Guanine (G) 1. Structure of DNA

  3. Like a puzzle, only certain nitrogen bases pair with one another. • Adenine pairs with Thymine • Cytosine pairs with Guanine • A-T and C-G 2. Base Pairing

  4. The first person to isolate DNA • Worked with White Blood Cells • White blood cells are cells that fight invaders in your body Some DNA History – Friedrich Meischer

  5. Isolated DNA from different organisms • Measured the amounts of the four bases (adenine, thymine, cytosine, and guanine) • He found that the amount of adenine = thymine and cytosine = guanine! • Therefore, A pairs with T and C pairs with G! Some DNA History - Chargaff

  6. British BioPhysicist • Made great contributions to the understanding of DNA • Her X-Ray diffraction images of DNA led to the discovery of the DNA double helix • Died at 37 from complications of ovarian cancer Some DNA History – Rosalind Franklin

  7. Franklin’s DNA photographs helped Watson and Crick figure out the structure of DNA in 1953 • Were awarded the nobel prize in 1962 DNA History – Watson and Crick

  8. To replicate means “to make a copy” • During interphase, the DNA is copied to prepare itself for cell division • The copy made is the exact same DNA as the parent DNA. 3. DNA Replication

  9. The DNA molecule “unzips” between the paired bases • New bases that float around in the nucleus are added to the old strand • Each new DNA molecule exactly matches the order in the original! What do you think would happen if there were mistakes made during DNA replication? (for example, wrong base pairs were added?) DNA Replication – The Process

  10. Replication to Protein http://www.youtube.com/watch?v=1fiJupfbSpg

  11. Discovery • http://www.youtube.com/watch?v=sf0YXnAFBs8 • Structure • http://www.youtube.com/watch?v=qy8dk5iS1f0 DNA Structure

More Related