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Biology 107

by: Ali Whittles

Biology 107 Biology 107

Ali Whittles
Cell Biology and Genetics
William Davis

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Hi Guys! These are the lecture notes from week on of Biology 107. The first lecture was just on the syllabus so I didn't add it. Hope they help!
Cell Biology and Genetics
William Davis
Class Notes
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This 2 page Class Notes was uploaded by Ali Whittles on Thursday September 10, 2015. The Class Notes belongs to Biology 107 at Washington State University taught by William Davis in Summer 2015. Since its upload, it has received 15 views.


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Date Created: 09/10/15
Lecture 2 Section One Nucleic Acids DNA amp RNA have been discovered as the components that make life The DNA structure was discovered in 1953 by Watson and Crick They won a nobel prize in 1962 for their discovery and shared with Wilkins as his studies that used 3D Xrays to look at DNA helped their discovery Nucleotide Structures Monomers Nitrogen base Sugar Phosphate group Nucleotides chemically connect to form DNA strands Nitrogen Bases Pyridines 6 member ring with two nitrogen atoms Cytosine Carboxyl group amp Amino Group Thymine Only found in DNA Two Carboxyl Groups Uracil Only found in RNA Twou Carboxyl Groups Purines 6 member ring with additional 5 member ring Adenine Guanine Sugars DNA deoxyribosecontains hydrogen RNA Ribose contains OH DNA amp RNA differ in the sugars the nitrogen base attaches to Chargaffs Rules The amount of each base in DNA isn39t equal However quot0 of A quot0 of T or U and quot0 of C o of G The actual percentage of each nitrogen base varies in each organism Watson and Crick Model Right handed double helix DNA structure This means that if you wrapped an enlarged strand of DNA around your hand the top corner would be able to match up to your thumb nitrogen bases located inside the helix sugar phosphate forms the outer backbone 10 bases per turn strands run antiparallel bases are opposite of their pair A amp T form 2 hydrogen bonds G amp C form 3 hydrogen bonds and are therefore harder to break since purines match up with pyridines 50 of Dna is GA and 50 is CT hydrogen bonds bond base pairs purines and pyridines often go every other strand


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