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Unformatted text preview: **The reaction that links two nucleotides together is dehydration; the bond formed is called a phosphodiester, and includes a P atom. In RNA, the 5 end has a phosphate group and in the opposite end (3), there is a hydroxyl group. 3 and 5 carbons are joined by phosphodiester linkage. RNA molecules usually exist as single polynucleotide chains. DNA molecules have two polynucleotides spiraling around an imaginary axis, forming a double helix. In the DNA double helix, the two backbones run in opposite 5 -> 3 directions from each other, an arrangement referred to as antiparallel. Hydrogen bonds form between bases in adenine (A) always with thymine (T), and guanine (G) always with cytosine (C) which is called complementary base pairing. Sugar-phosphates make up the backbones. The base pair is joined by hydrogen bonding....
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This note was uploaded on 02/21/2012 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas at Austin.
- Fall '09