Exam1-practice-summer14-KEY - Exam 1 BBIO 360 Genetics...

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Exam 1 – BBIO 360 Genetics Name ________________________________ Write your name on all pages- including this one. Please turn in this page with your exam. For multiple choice questions please write your answer in the space provided at the front of the question For essay questions: Answer in full sentences - the space provided is an indication of how long your answer should be A well-labeled diagram is an acceptable answer provided it answers the question. ***Avoid unclear terminology (aka They separate, It moves) ***** Not all the questions have a “right” answer. If the question asks you to explain, be sure to do so. You may use the back of this page as scratch paper or as additional space if you have an answer that runs long. If you do use it that way please write a note on the question so I know to look here. If you need more please ask. You have the full 2hr class period to finish the exam. If you are done before then please turn in your exam and exit the room. Page 1 of 8
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Exam 1 – BBIO 360 Genetics Name ________________________________ 1. _____B_____ (2pts) Protein is made from Messenger RNA in a process called . . . a. transcription b. translation c. cloning d. replication e. transformation 2. A gene develops a mutation at the transcription termination site. Is this likely to affect the amino acid composition of the protein that is produced? Why or why not (3pts) The transcription termination is where the polymerase stops making the RNA, but it is well beyond the stop codon at the end of the 3’UTR, so the RNA would be a little longer, and that might affect the lifetime of the RNA, but you would not expect it to affect the protein composition 3. Both the eukaryotic yeast, Saccharomyces cerevisiae and the prokaryotic bacterium Ralstonia solanacearum have about 5000 genes. However, Saccharomyces has about 12,000,000 base pairs in its DNA, while Ralstonia has only about 6,000,000. What feature of eukaryotes might account for this difference? (3pts) Introns. In eukaryotes genes are broken up by non-coding regions, called introns. This extra DNA makes eukaryotic genes much larger even thought they often encode fro proteins that are similar in size (or only slightly larger) then their prokaryotic ancestors.
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