BIO 1030 Study Guide - Quiz Guide: Arachnid, Corepressor, Operon
Document Summary
Study guide: biology 1030, test 5: review dna structure, complementary base pairing, and antiparallel nature. What is a gene and how are genes expressed: each strand of dna carries of sequence of bases of four types: adenine, thymine, cytosine, and guanine. Dna controlled sequence called a promoter: genes exist in a series called an operon. Dna polymerase (enzyme that copies dna: to replicate dna, the double helix must unwind, exposing base pairs to from new pairs with a growing strand. Unwinding requires initiation proteins and a helicase enzyme that spends atp to unwind dna. Repair enzymes recognize methylated dna as old dna, containing the original sequence. What are different levels of gene regulation? (describe the use of repressor/co- repressors/inducers in gene regulation). The regulatory protein will stick to the dna sequence near the promoter of the target gene and control whether transcription occurs: repressor proteins bind to dna sequences and prevent transcription.
