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Lecture 13

BIOL 1201 Lecture Notes - Lecture 13: Light-Independent Reactions, Thylakoid, ChloroplastPremium

School
Louisiana State University
Department
Biological Sciences
Course Code
BIOL 1201
Professor
Moroney, James
Lecture
13
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BIOL 1201- Lecture 13- DNA
Avery et al. Conclusions
•A molecule is reprogramming
•The bacteria making it pathogenic
•This properties of this molecule
•Are consistent with DNA or RNA
**Clicker questions**
Where is the Calvin Cycle located? Chloroplast stroma
Where is the electron transport chain located? Chloroplast thylakoid
Where are photosystem I and photosystem II located? Chloroplast thylakoid
Where is chlorophyll located? Chloroplast thylakoid
Hershey and Chase
•Labeled phage coat (protein) with 35S
•Do infected bacterial cells become radioactive (with 35S)?
oRadioactivity is not found in bacteria
•Labeled phage DNA with 32P
•Do infected bacterial cells become radioactive (with 32P)?
oRadioactivity is in bacteria
•Conclusions:
oDNA is entering the bacteria
oDNA is changing the programming
oDNA is the genetic molecule
Discovery of the structure of DNA
•Structure explains how genetic information is stored and passed on
•“Players” in the race to discover the structure of DNA: James Watson, Francis Crick,
Linus Pauling, Maurice Wilkins, Rosalind Franklin
•Watson deduced double helix from x-ray diffraction photo Wilkins showed him
DNA STRUCTURE
•Polymer of nucleotides
oNucleotide
Deoxyribose sugar
Phosphate group
Nitrogenous base
•DNA is “double stranded” - two polymers, joined at the nitrogenous bases
•**Know this structure**
•
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