exam 3-answer key - Your Name: Exam 3. BIO 325 Genetics...

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Your Name: 1 Exam 3. BIO 325 Genetics – Apr. 13, 2009 1-7 ; Fill the blank with word(s). (2 points ea.; no partial score) 1. Mutations in either of two sites in operon will produce a constitutive phenotype. These two sites are _ operator ____ or __ repressor_ ____. (if operator was one of your answers, then considered right) 2. The most critical step in the regulation of most bacterial genes is the binding of _ RNA_ _ ___ polymerase ___ to the ___ promoter _____. 3. Numerator and denominator elements regulate sex-determination in Drosophila . If the ratio of numerator homodimers to numerator/denominator heterodimers is high, the __ Sxl ___ gene will be expressed, generating a fly with ______ female ______ sexual characteristics. 4. “Certain covalent modifications of Histone can dictate the fate of gene expression at given loci” is referred as ____ histone ___ ___ code __ hypothesis. 5. ___ Ubiquitin ______ is a small protein that is covalently attached to polypeptides in long chains, targeting the tagged peptide for degradation ( some spelling errors are OK, but make sure you know it right ) 6. __ Enhancer _______ as cis -acting DNA sequences can function at a distance from the gene they are regulating, either 5’ or 3’ of the gene. 7. RNA polymerase I in eukaryotes synthesizes _____ rRNA ____ using a DNA template. 8 – 11. True or False; Circle one ( 1 pt ea.) 8. Because there is no nuclear membrane in prokaryotes, transcription and translation from a single gene can be taking place at the same. True False 9. Genomic imprinting is an example of epigenetic alteration of DNA. True False 10. non-coding RNAs as regulatory molecules always exist as small RNA nucleotides (less than 30 nucleotides). True False 11. trimethylation at Histone H3 Lys 4 usually associated with transcriptionally repressed chromatins. True False
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Your Name: 2 Choose the BEST answer. Some multiple choice questions may have 1 ~ 5 correct answers (indicated in the questions). You should CIRCLE all correct answer(s) to be scored (no partial score); (3 pts ea.) 12. Catabolic pathways that break down complex substances into more usable units are usually regulated by the A. end products of the pathway. B. substrate of an enzyme in the pathway. C. other metabolites that are limiting. D. all of the above. E. none of the above. 13. Anabolic pathways involved in the synthesis of essential molecules are usually regulated by A. end product of the pathway. B. substrate of the pathway. C. other metabolites that are limiting. D. all of the above. E. none of the above. 14. In the genotype presented below, what will the expression phenotype for β -galactosidase be (I + p + o c Z - Y - A + /I + p + o + Z - Y + A - )? A. inductive
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exam 3-answer key - Your Name: Exam 3. BIO 325 Genetics...

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