Exam 3 SA Key - BIO 172 Winter 2008 Exam 3 Short Answer KEY...

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BIO 172 Winter 2008 Exam 3 Short Answer KEY 31. 8 pts The regulatory gene product that was mutated functions as a repressor of the operon for the cell wall synthesis genes. The repressor binds to the operator and prevents transcription. This is an example of negative control of the operon. 32. 8 pts (2 pts for each part -- A, B, C, D) A. Euks: Chromatin structure of DNA must be opened for gene transcription to occur >> default state is OFF Proks: No chromatin is present and promoters are readily accessible to RNA pol >> default state is ON B. Euks: Primary transcripts in euks are processed to mRNA by slicing out introns; alternative splicing allows more than one protein from each gene Proks: no introns, correspondence between genes and proteins is one-to-one C. Euks: Huge number of transcriptional regulatory proteins reflecting cell diversity/differentiation. Need to give some explanation as to why it is more complex (greater diversity/differentiation, many regulators control a given gene expression)
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Exam 3 SA Key - BIO 172 Winter 2008 Exam 3 Short Answer KEY...

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