Hand in W.S. Tuning in to radioisotopes - PowerPoint PPT Presentation

About This Presentation
Title:

Hand in W.S. Tuning in to radioisotopes

Description:

From: http://www.pbs.org/wgbh/nova/photo51/pict-01.html. 9/19/09. Page: 6. Watson and Crick ... Replication (PBS) DNA double helix (like a spiral staircase) is ... – PowerPoint PPT presentation

Number of Views:24
Avg rating:3.0/5.0
Slides: 12
Provided by: tegrityc
Learn more at: https://www.senecahs.org
Category:

less

Transcript and Presenter's Notes

Title: Hand in W.S. Tuning in to radioisotopes


1
Class Topics
Title Biology 3/14/07
Objectives
  • To learn about the historical discoveries
    surrounding the genetic material, DNA.
  • Hand in W.S. Tuning in to radioisotopes
  • Check Grade Sheets
  • Review Chapter 9 Quiz 1
  • Review DNA structure Photo 51
  • Notes Chapter 9
  • "No one can make you feel inferior without your
    consent."
  • Eleanor Roosevelt

Wednesday, July 22, 2015 1150 AM
2
Class Assignments
By When
What
  • W.S. Tuning in to Radioisotopes 3/14/07
  • Read 194-200 3/14/07
  • W.S. 9.2 3/16/07
  • Doublin DNA 3/16/07
  • Due this class period
  • Due next class period
  • Due in the future

3
Grade Sheet
2A p. 157 (5 pts.)
4
Rosalind Franklin
  • 1951 - X-ray diffraction
  • Maurice Wilkins
  • Suggested that DNA was two strands
  • Tightly coiled helix
  • Photo 51, flash

5
From http//www.pbs.org/wgbh/nova/photo51/pict-01
.html
6
Watson and Crick
  • James Watson (American) and Francis Crick
    (British) discovered the shape and organization
    of DNA
  • Double helix
  • two strands
  • sugar/phosphate backbone
  • nitrogenous bases in middle
  • Won Nobel Prize for DNA model
  • with Maurice Wilkins

7
(No Transcript)
8
Replication (PBS)
  • DNA double helix (like a spiral staircase) is
    easily replicated (doubled)
  • Occurs during S phase of cell cycle
  • 1. Enzyme, DNA helicase, attaches to DNA
    molecule
  • Hydrogen bonds between strands break (DNA unzips
    and unwinds)
  • Forms replication forks
  • Areas where the strands separate

9
Replication (DNAi)
  • 2. DNA polymerase bonds free nucleotides
    (floating in nucleus) to exposed nitrogen bases
  • adenine to thymine guanine to cytosine
  • 3. Hydrogen bonds formed between nitrogen bases
  • Proofreading
  • DNA polymerase can go back and check for errors
  • 1 error per 1 billion nucleotides

10
(No Transcript)
11
Lab Doublin DNA
  • Procedure 1 and 2 cut out the nucleotides
  • 3. Use the DNA strand
  • GTCAACTG
  • 4. Have work checked after 4
  • Pick up your homework W.S. when done.
Write a Comment
User Comments (0)
About PowerShow.com