Hrincevich_CH_9_student_outline_using_Starr_CH_13

Hrincevich_CH_9_student_outline_using_Starr_CH_13 - DNA The...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 9 DNA: The Molecule of Heredity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Miescher Discovered DNA 1868 Johann Miescher investigated the chemical composition of the nucleus Isolated an organic acid that was high in phosphorus He called it “nuclein” We call it DNA (deoxyribonucleic acid)
Background image of page 2
Mystery of the Hereditary Material Originally believed to be an unknown class of proteins Rationale was… Heritable traits are diverse Molecules encoding traits must be diverse Proteins are made up of 20 amino acids and structurally diverse
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Structure of the Hereditary Material Experiments in the 1950s showed that DNA is the hereditary material Scientists raced to determine the structure of DNA 1953- Watson and Crick proposed that DNA is a double helix
Background image of page 4
Discovery of DNA Funtion: 3 critical experiments
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Early and puzzling clues
Background image of page 6
1928 Attempting to develop a vaccine Isolated two strains of Streptococcus pneumoniae Rough strain (R) was harmless Smooth strain (S) was pathogenic #1: Griffith Discovers Transformation”
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Griffith Discovers Transformation 1. Mice injected with live cells of harmless strain R. 2. Mice injected with live cells of killer strain S. 3. Mice injected with heat-killed S cells. 4. Mice injected with live R cells plus heat-killed S cells. R S dead S R + dead S X X
Background image of page 8
Transformation What happened in the 4th experiment? The harmless R cells had been transformed by material from the dead S cells Descendents of the transformed cells were also pathogenic
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Living R strain Living S strain Heat-killed S strain Living R strain, heat-killed S strain Bacterial strain(s) injected into mouse Results Conclusions
Background image of page 10
So what exactly was the transforming
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 44

Hrincevich_CH_9_student_outline_using_Starr_CH_13 - DNA The...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online