Popular in Intro to Biology
Popular in Department
This 1 page Class Notes was uploaded by Kristen Walsh on Friday March 20, 2015. The Class Notes belongs to BSC 108 at University of Alabama - Tuscaloosa taught by Dr. Yates in Spring2015. Since its upload, it has received 83 views.
Reviews for Chapter 10
Report this Material
What is Karma?
Karma is the currency of StudySoup.
Date Created: 03/20/15
Ii Chapter 10 The Structure of DNA DNA and RNA structure Nucleic acids that consist of chemical units called nucleotides The nucleotides are joined by a sugarphosphate backbone Four nucleotides found in DNA 0 Differ in their nitrogenous bases 0 T Thymine C Cytosine A Adenine G Guanine Watson and Crick s DNA model suggested that DNA replicates by a template mechanism DNA replication 0 Begins at specific sites on a double helix 0 Proceeds in both directions 0 4 strands 2 Parental and 2 daughter strands o Dozens of enzymes are need to make the covalent bonds and to keep the DNA unzipped Fast and accurate process 0 Only about 1 in 1 billion bases is incorrectly paired which leads to mutations DNA can be damaged by UV light 0 The enzymes and proteins involved in replication can repair the damage 0 The flow of genetic information in a cell DNA gt RNA gt Protein DNA functions as the inherited directions for a cell or organism DNA specifies the synthesis of proteins in two stages 0 Transcription DNA gt RNA 0 Translation RNA gt Polypeptide Codon every three nucleotides In eukaryotic cells transcription occurs in the nucleus Mutations any change in the nucleotide sequence of DNA 0 May result from errors in DNA replication or physical or chemical agents called mutagens 0 Can be good bad or result in no change depending on The type of change Where the change in DNA occurs If the change is detected and fixed before replication How it affects the organism and its survival 0 The basis of cancer many genetic diseases and evolution 0