1. Nucleic Acids

2. 10/29 Put away phone/earbuds WARM UP
List the 2 main stages of the cell cycle including the phases of each one and describe what happens in the 2 main stages

3. Introduction to DNA

4. DNA Facts
Even though it codes for all information that makes up an organism, DNA is built using only 4 building blocks
Every human being shares about 99% of their DNA with every other human.
Every cell in the body has the exact same DNA.
DNA was discovered in 1869, but scientists did not understand it.

5. Function of DNA
Stores & transmits genetic info from one organism to next generation
Instructs cells on work to do

6. DNA
Deoxyribonucleic Acid

7. Built from subunits called ____________________
NUCLEOTIDES
SUGAR in DNA is
________________
Image by: Riedell
deoxyribose

8. Turn to a Partner What are the three parts of the above structure?
This structure is called?

9. There are 4 Possible nitrogen bases in DNA
ADENINE
(G) GUANINE
(C) CYTOSINE
(T) THYMINE

10. Complimentary Base Pairing
A pairs only w/T
C pairs only w/G

11. Turn to a Partner…
Describe base-pairing rules

12. Nucleotides form a long polymer of DNA called Double Helix
Double STRANDED
Backbone
(sides of ladder)
made of phosphates & sugars
Image from:

13. Nitrogen bases =“Steps of ladder”
Held together by weak hydrogen bonds
Phosphate group
Deoxyribose sugar
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14. Turn to a Partner CC
What are parts A, B & C?
A B A

15. Double Helix Discoveries
Rosalind Franklin – X-ray diffraction showed DNA helix was 2 strands

16. Double Helix Discoveries
Watson & Crick (1953) – exact structure: double helix held together by nitrogen bases

17. The Mystery Woman of DNA
Rosalind Franklin Video

18. DNA is Found in the Nucleus on Chromosomes

19. DNA Code
Sequence of nucleotides carries genetic information/ instructions
Different organisms have a different sequence of nucleotides.

20. DNA in other organelles

21. Cornell Summary and Study Questions