Unit v ch9 dna
-
Upload
guest8d14155 -
Category
Documents
-
view
258 -
download
3
Transcript of Unit v ch9 dna
![Page 1: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/1.jpg)
1
Biology: Life on Earth
Chapter 9DNA: The Molecule of Heredity
and holds the Genetic Code
![Page 2: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/2.jpg)
Watson & Crick
Wilkins Franklin
Scientists who discovered
structure of DNA 1953
X-ray diffraction
![Page 3: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/3.jpg)
The 4 Nucleotides of DNANitrogen base order is the code for genes Purines Pyrimidines
![Page 4: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/4.jpg)
4Watson-Crick modelof DNA Double Helix
Hydrogen bonds between complementary nitrogen base pairs
Covalent bonds between phosphates & deoxyribose sugars
![Page 5: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/5.jpg)
DNA Replication in Nucleus
Both strands of helix used as template
http://www.youtube.com/watch?v=AGUuX4PGlCc
is Semiconservative
![Page 6: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/6.jpg)
DNA Helicase:DNA Helicase: unwinds unwinds DNA by breaking H DNA by breaking H
bonds between basesbonds between bases
DNA polymerase:DNA polymerase: adds adds loose complementary loose complementary nucleotides to growing nucleotides to growing
strandsstrands
DNA ligase:DNA ligase: connects connects short strands togethershort strands together
Proofreading/Repair Proofreading/Repair enzymes:enzymes: from 1/10,000 from 1/10,000
to 1/billion mistakesto 1/billion mistakes
![Page 7: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/7.jpg)
7
Mutation: permanent
change in DNA base sequence
Mutation in gamete is inherited
![Page 8: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/8.jpg)
Werner Syndrome
Mutation in DNA replication enzyme
Causes errors/mutations to accumulate rapidly
![Page 9: Unit v ch9 dna](https://reader033.fdocuments.in/reader033/viewer/2022052400/559703e21a28ab674f8b473b/html5/thumbnails/9.jpg)
Ancient DNA – 100 million year old Biting Midge preserved in amber