genetics midterm 2 2008_prof.martens

genetics midterm 2 2008_prof.martens - BIOSC 0350 Name:...

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Unformatted text preview: BIOSC 0350 Name: Spring Term 2084 Second Mid-Term Exam Signature: March 6, 2008 Dr. Joe Martens INSTRUCTIONS: 1. Print your name at the top of each page and make sure you have 15 exam pages that includes two pages of scrap paper and a page containing the genetic code. 2. Sign the first page of this examination in the space provided. 3. Take a few moments to look over the entire exam before answering any questions. Then, begin with the questions you are most comfortable answering. 4. Show your work. In some cases partial credit will be given. 5. Please write legibly. Make your drawings clear. Be concise; you will not be given credit for extraneous information. 6. Some of the model systems described in this exam parallel actual genetic systems but are solely derived from the imagination of the instructors. 7. Remember to relax and do your best. Good Luck!! Be sure to attempt all of the questions. If you are having difficulty with any one question or one part of one question, move on and come back to these later. Print Answer key Name Page 2 of 15 BIOSC 0350 Mid-Term Exam 1 February 1, 2007 Question Possible Points Score 1 20 2 20 3 20 4 22 5 18 Total 100 Name Page 3 of 15 BIOSC 0350 Mid-Term Exam 1 February 1, 2007 1. 20 points (2 points/question) Answer the following multiple-choice questions by circling the correct answer. i) The complementary sequence of 5' AATTCGCTTA 3' is A. 5' AATTCGCTTA 3'. B. 3' AATTCGCTTA 5'. C. 5' TAACGCTTAA 3'. D. 5' TAAGCGAATT 3'. E. 3' TAAGCGAATT 5'. ii) Assume that a new low-calorie sweetener is developed. The structure is novel and is tested with the Ames test for mutagenicity. The following results are obtained: Sample Number of his + revertent colonies distilled water 2 distilled water + rat liver enzymes 3 sweetener 3 sweetener + rat liver enzymes 65 What conclusion is most consistent with this data? A. The sweetener is not mutagenic. B. Rat liver enzymes are highly mutagenic. C. The sweetener is not mutagenic but can be converted into strong mutagens. D. The sweetener is mutagenic and can be converted into strong mutagens. E. The sweetener and its conversion products are equally mutagenic. iii) Indicate the statement that is most accurate regarding mutations. A. Most mutations alter protein structure and phenotype. B. Only those mutations that alter protein structure will alter phenotype. C. Mutations altering a region that does not code for a protein may alter phenotype. D. All mutations that alter protein structure will alter phenotype. E. All altered phenotypes result from altered proteins. iv) Mutations that result in much less of a protein or a protein with limited function are known as A. null mutations....
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genetics midterm 2 2008_prof.martens - BIOSC 0350 Name:...

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