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Unformatted text preview: Answers to Lecture Questions from 3‐3‐10 Lecture (Question numbers below match those in the VNET document, “1362 CH 17‐20 Questions to be covered during lecture”) 10. After the transformation step in a DNA cloning experiment, one usually first screens for clones with antibiotic resistance. What does this tell you about the cells that have grown on these plates containing antibiotic? A. they only have circularized foreign DNA B. they contain the plasmid vector C. they have plasmid vector containing the foreign DNA inserts. D. a, b, and c are all true. E. Only b and c are true. Answer: E 13. Which of the following is true concerning all viruses: A. They can infect the same cells. B. They all contain DNA. C. They cannot independently perform metabolic activities. D. They all are comprised only of a capsid surrounding their nucleic acid. E. All of the above are true. Answer: C Questions not covered in class but are in the VNET document, “1362 CH 17‐20 Questions to be covered during lecture”: 3. Introns are DNA sequences that: A. code for functional domains in proteins. B. are removed from pre‐mRNA by spliceosomes. C. allow one gene to make different gene products, depending on the pattern of intron excision & splicing. D. Both b and c Answer: D 7. The area of the tryptophan operon labeled 3 is the: A. promoter. B. repressor gene. C. ribosome. D. RNA polymerase. E. None of the above. Answer: E; binds to the operator (not listed here) 9. Activator proteins stimulate transcription in eukaryotes by binding to: A. the operator. B. enhancers. C. exons. D. repressors. E. operons. Answer: B 11. A virus has expanded its host range and is now able to infect other host cell types. What can account for this? The virus mutated generating a form capable of infecting other types; changes occurred that resulted in altered glycoproteins or capsid proteins such that it can now recognize & infect different host cells. NOTE: answers to most of the remaining questions in the VNET document, “1362 CH 17‐20 Questions to be covered during lecture” are found in the “Answers to Exam 2 Review Questions”(on VNET); remaining questions (#14‐17) will be posted Monday. ...
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- Spring '08