Presentation is loading. Please wait.

Presentation is loading. Please wait.

8.2 Structure of DNA Set up Cornell Notes on pg. 67 Topic: 8.2 Structure of DNA Essential Question: Explain the base-pairing rules. How many types of nucleotides.

Similar presentations


Presentation on theme: "8.2 Structure of DNA Set up Cornell Notes on pg. 67 Topic: 8.2 Structure of DNA Essential Question: Explain the base-pairing rules. How many types of nucleotides."— Presentation transcript:

1 8.2 Structure of DNA Set up Cornell Notes on pg. 67 Topic: 8.2 Structure of DNA Essential Question: Explain the base-pairing rules. How many types of nucleotides are there? How do they differ? Don’t forget to add it to your T.O.Contents! 2.1 Atoms, Ions, and Molecules Explain the base-pairing rules. How many types of nucleotides are there? How do they differ? 8.2 Structure of DNA Key Concept:DNA structure is the same in all organisms

2 8.2 Structure of DNA KEY CONCEPT DNA structure is the same in all organisms.

3 8.2 Structure of DNA DNA is composed of four types of nucleotides. Each nucleotide has three parts. 1. a phosphate group 2. a deoxyribose sugar 3. a nitrogen-containing base phosphate group deoxyribose (sugar) nitrogen-containing base Covalent bonds base backbone

4 8.2 Structure of DNA The nitrogen containing bases are the only difference in the four nucleotides. Thymine- T Adenine- A Guanine- G Cytosine-C BASES

5 8.2 Structure of DNA

6 Watson and Crick determined the three-dimensional structure of DNA by building models. They realized that DNA is a double helix –backbone on the outside –bases on the inside. backbone bases

7 8.2 Structure of DNA Watson and Crick’s discovery built on the work of Rosalind Franklin and Erwin Chargaff. –Franklin’s x-ray images suggested that DNA was a double helix of even width. –Chargaff’s rules stated that A=T and C=G.

8 8.2 Structure of DNA T A C G Nucleotides always pair in the same way. the helix has a uniform width. –Ex: ladder – A pairs with T – C pairs with G

9 8.2 Structure of DNA The backbone is connected by covalent bonds. hydrogen bondcovalent bond The bases are connected by hydrogen bonds. backbone Hydrogen bond Bases (A,T,G,C)

10 8.2 Structure of DNA A T C C G A T G A T GC

11 GATTACAATCGATCGAT CTAATGTTAGCTAGCTA TAGGACTACTAGTCGTA ATCCTGATGATCAGCAT Using the base pairing rules- complete the DNA strand:

12 8.2 Structure of DNA Adenine (A) = Green Thymine (T) = Pink Cytosine (C) = Yellow Guanine (G) = Orange Have Your DNA & Eat It Too * I need to check your work before you eat the DNA!!!!!


Download ppt "8.2 Structure of DNA Set up Cornell Notes on pg. 67 Topic: 8.2 Structure of DNA Essential Question: Explain the base-pairing rules. How many types of nucleotides."

Similar presentations


Ads by Google