Properties of Genetic Material

Properties of Genetic Material - paired with a...

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Properties of Genetic Material DNA is an ideal genetic material because it can store information, is able to replicate, and is able to undergo changes (mutate). Structure of DNA DNA is composed of units called nucleotides. Each nucleotide contains a phosphate group, a deoxyribose sugar, and a nitrogenous base. The nucleotides joined together to form a chain. The phosphate end of the chain is referred to as the 5' end. The opposite end is the 3' end. DNA is composed of two chains of nucleotides linked together in a ladder-like arrangement with the sides composed of alternating deoxyribose sugar and phosphate groups and the rungs being the nitrogenous bases as indicated by the diagram below.
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The "A" of one strand is always paired with a "T" on the other. Similarly, the "G" of one strand is
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Unformatted text preview: paired with a "C" on the other. The two strands are held together by hydrogen bonds (electrostatic attraction). Two hydrogen bonds hold adenine to thymine. Three bonds attach cytosine to guanine as indicated in the diagram above. During the process of cell division, the DNA becomes tightly coiled, forming structures called chromosomes . The diagram below is a portion of a double-stranded chromosome showing the centromere and a portion of the base sequence. The diagram does not show the extensive looping and coiling and the proteins associated with coiling. Notice that the base sequence in the two chromatids is identical....
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This note was uploaded on 11/10/2011 for the course BIOLOGY bi 101 taught by Professor - during the Fall '10 term at Montgomery.

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Properties of Genetic Material - paired with a...

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