1 / 10

DNA and RNA

This text explains the discoveries of Griffith, Avery, Hershey-Chase, Watson, and Crick regarding the role of DNA in transmitting genetic information. It covers the concepts of transformation, nucleotides, DNA structure, and nitrogen base pairing.

sheldona
Download Presentation

DNA and RNA

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. 12-1 DNA and RNA

  2. Griffith • Griffith was trying to figure out how bacteria made people sick • Isolated two strains of pneumonia bacteria for mice • They were easy to grow in a culture and easy do distinguish between the two types by look

  3. Griffith mixed some of the deadly strain of the bacteria that had been killed with the harmless strain of bacteria. • Alone both were harmless but the mixture caused the mice to get pneumonia and die • Somehow the killed bacteria passed their disease causing ability to the harmless strain • Transformation – when an organism is permanently changed into another

  4. Avery • Oswald Avery discovered that the nucleic acid DNA stores and transmits the genetic information from one generation of an organism to the next

  5. Hershey-Chase • Used bacteriophages to test Avery’s discovery and concluded he was correct • Bacteriophages – virus that infects bacteria

  6. Components and Structure of DNA • DNA is a long molecule made up of units called nucleotides • Nucleotides – units that make DNA, made of 3 parts. • Sugar • Phosphate • Nitrogen base

  7. The Double Helix • Watson and Crick two scientist that discovered the structure of DNA • DNA is made up of nucleotides that connect to each other and repeat over and over • This make a ladder shape that then twists

  8. Nitrogen base pairing • 4 possible nitrogen bases • Adenine, Guanine, Cytosine, Thymine • A always bonds with T A-T • G always bonds with C G-C

More Related