Biology 2581B Study Guide - Quiz Guide: Stop Codon, Start Codon, Mutation
Document Summary
Dna is located in the nucleus where it is copied into rna during transcription using the enzyme rna polymerase. It is them exported out into the cytoplasm where rna is translated into a protein: the transcribed rna is called the primary transcript, the primary transcript contains introns which are spliced out to produce mrna. Point mutation- a single base change: transitions change purine --> purine or pyrimidine --> pyrimidine, these are more common in nature, transversions change purine --> pyrimidine or pyrimidine --> purine. Insertions and deletions (indels: can be small (single bp, can be very larger (many kb) Includes a variable copy number of repeat sequences. If bases are inserted or deleted, it will cause the reading frame to shift. If 3 base pairs or a multiple of 3 bp are inserted or deleted, then the frame shift won"t be altered.