BIOL 150B Lecture Notes - Lecture 3: Peptide, Cell Nucleus, Nitrogenous Base

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19 Feb 2018
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Usually in a proper cellular environment, a newly synthesized polypeptide chain spontaneously folds into its functional shape. A protein can have four levels of structure. A primary structure - a unique amino acid sequence. Secondary structure - how the polypeptide folds up. (is there a bend in the structure or is it balled up?) Tertiary structure - the overall 3 - d shape of a polypeptide. (that results from interactions between the r groups of amino acids) Quaternary structure - 2 or more polypeptide chains (subunits) Amino acid sequence of a polypeptide is programmed by a gene. Dna sits in the nucleus of the cell, where as rna is transcribed in the nucleus of the cell and then sent out. Genes are a discrete unit of inheritance. Genes consist of 50% dna and 50% proteins. Dna is a type of nucleic acid. Dna is inherited from an organism"s parents. It has codes to its own replication.

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