Lectures 19 and 20

Lectures 19 and 20 - o Like puzzle pieces: A=T pair can...

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Lectures 19 and 20 Broad classes of proteins - Fibrous o Extended fiber like structures Hair, muscles, collagen Not soluble in water - Globular Genetic Material: DNA and RNA - Just as proteins can be considered polymers of amino acids, DNA and RNA are polymers of nucleotides. - Nucleotide = phosphate + sugar + base DNA Nucleotide Components - In DNA, the “sugar” is deoxyribose. - There are four possible bases in DNA. (A, C, G, T) RNA - RNA has uracil base instead of thymine. - RNA “sugar” is ribose. Double Helix - Complementary base pairs exist o There is enough room for exactly an A-T pair of a C-G pair inside the double helix
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Unformatted text preview: o Like puzzle pieces: A=T pair can make two hydrogen bonds, C-G pair can make three.-DNA exists as a double helix shape, with the two helices held together through hydrogen bonding. Translation-A sequence of three bases indicates specific amino acids. o Example: AAA = lysine, AAC = asparagines o 3-base sequences called codons-Converting information from nucleotide sequence to amino acid sequence in a protein is translation. o Portion of DNA unwinds o mRNA reads and codes (transcription) o tRNA links amino acids in correct order...
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Lectures 19 and 20 - o Like puzzle pieces: A=T pair can...

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