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 Symbol
System  Times New Roman  Times New Roman
  Symbol 0 Courier New Brandon C. Hall
Tuesday, January 28, 1997
Chapter 10
Chemical Basis of Genetics
12.2 Structure of DNA
Breakthrough in genetic research took place in 1953 at Cambridge University in Great Britain. By James D. Watson, an american biologist, and Francis H.C. Crick, a British biophysicist, discovered the structure of DNA.

Existing Knowledge of DNA
Levene in the 1920's found that DNA contained four nitrogen-carrying bases called adenine, guanine, thymine , and cytosine. Five-carbon sugar deoxyribose. Together with a phoshate group is called nucleotide.

The Watson-Crick Model
Then sequence of the nucleotides is the code that controls the production of all the proteins of an organism. A gene is a sequence of nucleotides that controls the production of a polypeptide of an RNA molcule.

12.4 DNA and RNA
DNA, with its blueprint for protein synthesis, is located in the cell nucleus. Yet the maufacture of protein moleculestakes place in the cytoplasm of the cell on the structures called ribosomes. DNA molecules do not leave the nucleus to control the production of the protein. Instead, another type of nucleic acid acts as a messenger between DNA and ribosomes and carries out protein synthesis. This nucleic acid is called RNA, or ribonucleic(ry boh noo klee ihk) acid. Three kinds of RNA = messenger mRNA, Transfer tRNA, Ribosomal rRna.
RNA contains ribose instead of deoxyribose and uracil instead of thymine

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{  MS Sans Serif
 Symbol
System  Times New Roman  Times New Roman
  Symbol 0 Courier New Brandon C. Hall
Tuesday, January 28, 1997
Chapter 10
Chemical Basis of Genetics
12.2 Structure of DNA
Breakthrough in genetic research took place in 1953 at Cambridge University in Great Britain. By James D. Watson, an american biologist, and Francis H.C. Crick, a British biophysicist, discovered the structure of DNA.

Existing Knowledge of DNA
Levene in the 1920's found that DNA contained four nitrogen-carrying bases called adenine, guanine, thymine , and cytosine. Five-carbon sugar deoxyribose. Together with a phoshate group is called nucleotide.

The Watson-Crick Model
Then sequence of the nucleotides is the code that controls the production of all the proteins of an organism. A gene is a sequence of nucleotides that controls the production of a polypeptide of an RNA molcule.

12.4 DNA and RNA
DNA, with its blueprint for protein synthesis, is located in the cell nucleus. Yet the maufacture of protein moleculestakes place in the cytoplasm of the cell on the structures called ribosomes. DNA molecules do not leave the nucleus to control the production of the protein. Instead, another type of nucleic acid acts as a messenger between DNA and ribosomes and carries out protein synthesis. This nucleic acid is called RNA, or ribonucleic(ry boh noo klee ihk) acid. Three kinds of RNA = messenger mRNA, Transfer tRNA, Ribosomal rRna.
RNA contains ribose instead of deoxyribose and uracil instead of thymine

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