Extracting DNA from the Bacterium Escherichia Coli Free Essay, Term Paper and Book Report
Deoxyribonucleic acid is contained in all cells. The structure of DNA makes gene transmissionpossible. Since genes are segments of DNA, DNA must be able to make exact copies of itself to enable thenext generation of cells to receive the same genes. The DNA molecule looks like a twisted ladder. Each"side" is a chain of alternating phosphate and deoxyribose sugar molecules. The "steps" are formed bybonded pairs of purine-pyrimidine bases. DNA contains four such bases the purines adenine (A) and guanine(G) and the pyrimidines cytosine (C) and thymine (T). The RNA molecule, markedly similar to DNA, usually consists of a single chain. The RNA chaincontains ribose sugars instead of deoxyribose. In RNA, the pyrimidine uracil (U) replaces the thymine ofDNA. DNA and RNA are made up of basic units called nucleotides. In DNA, each of these is composed of aphosphate, a deoxyribose sugar, and either A, T, G, or C. RNA nucleotides consist of a phosphate, aribose sugar, and either A, U, G, or C. Nucleotide chains in DNA wind around one another to form a complete twist, or gyre, every tennucle......
Word Count: 1097
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