NATS 1670 Lecture Notes - Lecture 28: Cytosine, Cell Nucleus, Guanine
26 Mar 2017
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Atom: the smallest chemical unit of matter. Molecule: two or more atoms held together by chemical bond (methane, ch4) Dna is the molecule responsible for transmission to information from one generation to the next in most forms of life on this planet. Exceptions are some viruses that use rna (ribonucleic acid) as their hereditary molecule, and prions that apparently use proteins as their hereditary molecule. Nucleotides are monomers that consist of a sugar. Phosphodiester bond: nucleotides polymerize to produce nucleic acids through formation of a phosphodiester linkage b/t the phosphate group on the 5" carbon of one nucleotide and the oh group of the 3" carbon of another. Dna"s primary structure consists of a sequence of nitrogen-containing bases, which contain information in the form of a molecular code. Adenine, guanine, thymine, cytosine (a-t and g-c through hydrogen bonding) The two stands are antiparallel (opposite directions) Strands are held together by complementary base pairings.
