LECTURE 11 Molecular Complexity of the Cell

LECTURE 11 Molecular Complexity of the Cell - 13 cells in...

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2:010 Principles of Biology Lecture 11 Molecular Complexity of the Cell This structure can help us explain how DNA can have the necessary properties of genetic material. The genetic material must have enough information to produce a complete life form during reproduction, development and maturation. - the information could be contained in the specific sequence of nucleotide bases - even though only 4 different bases are used it is still possible to have many different sequences. - there is a huge amount of DNA in the nucleus In humans there are 46 double stranded DNA molecules in each cell. One in each chromosome. Chemical analysis shows that this is 6 X 10 9 base pairs The length of one base pair is 0.34 X 10 -9 m Therefore, the length of DNA/cell is about 2 meters Since there are about 10
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Unformatted text preview: 13 cells in the human body there are 2 X 10 13 meters of DNA/person. This is a distance that is about equal to 70 trips back and forth to the sun from Earth. The structure also leads to a possible mechanism as to how the DNA can be replicated in an accurate way so that the genetic material could be passed on to offspring. Each strand of the double helix is able to serve as a template for the synthesis of its complementary strand. Since a base on one strand is complementary to only one specific base, this results in the determination of the base at that position in the complementary. We will spend more time later on the mechanism of DNA synthesis strand. Variation among individuals may arise as a result of differences in the sequence of bases in the DNA....
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This note was uploaded on 03/30/2008 for the course BIO 2:010 taught by Professor Denburg during the Spring '08 term at University of Iowa.

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