MICR 200B Midterm: MICR200B MIDTERM 2 REVIEW
16 Jan 2018
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Document Summary
End is wobble position, creates redundancy in the code ( exible. Total of 4 possible nucleotides, 3 nucleotides per codon, 64 possible codons. Coding strand, 5" to 3", on top, template strand underneath (3" to 5") Forms mrna strand which leads to polypeptide chain of proteins. Bacteria & archaea = uninterrupted genes (no introns) Bac, arch, and eek generally do not have overlapping genes. Promoter (where rna polymerase binds to dna -> aided by sigma factor = recognizes promoter and initiation site) Terminator (ends transcription) translation: shine-delgarno, initiation codon, stop codon. Polycistronic mrna (multiple translational start and stop site) Many messages are polycistonic, is one promoter region that binds to rna polymerase and transcription will continue. Many bacteria use this, rare in eukaryotes. Allows bacteria and archaea to transcribe several genes sequentially on a single mrna. Eukaryotes have one promoter per gene (monocistronic)
