BIO 121 Lecture Notes - Lecture 13: Dna Repair, Intron, Rna Splicing
11 Oct 2017
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Document Summary
A pairs with t, c pairs with g. Special repair enzymes fix incorrectly paired nucleotides. Eukaryotic chromosomal dna molecules have special nucleotide sequences at their ends called . The bacterial chromosome is a double-stranded, circular dna molecules associated w/ a. Eukaryotic chromosomes have linear dna molecules associated with a . Large amount of small amount of protein proteins. In bacterium, the dna is supercoiled and found in a region of the cell called the nucleoid. Transcription : dna to rna (in the nucleus) Messenger rna : carries genetic message of dna to ribosomes in the cytoplasm. Translation : uses mrna to produce proteins; occurs at ribosomes. Gene expression : process by which dna directs the synthesis of proteins (sometiems. One gene-one polypeptide hypothesis: states that each gene codes for a polypeptide. Triplet code : the instructions for building a polypeptide chain. Determining proteins from genes is based on a triplet code. During translation, the mrna base triplets, called .
