Exam%203-%20Practice%20on%20DNA%20Chapter

Exam%203-%20Practice%20on%20DNA%20Chapter - Version PREVIEW...

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Version PREVIEW – Exam 3- Practice on DNA Chapter – Sathasivan – (50445) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. DNA 08 001 10.0 points To prove that there is a clear correlation be- tween DNA and genetic inFormation some stu- dents in a science Fair wanted to repeat Her- shey and Chase’ experiment using labeled ni- trogen instead oF labeled phosphate on the as- sumption that there are more nitrogen atoms in a nucleotide than phosphate. Why will this experiment not work? 1. Meselson and Stahl already did this ex- periment. 2. Compared to phosphate there are more nitrogens in a nucleotide, so the latter are more radioactive. 3. Amino acids and thus proteins also have nitrogen atoms; thus the radioactivity would not distinguish between DNA and proteins. correct 4. Radioactive nitrogen has a halF-liFe oF 100,000 years and the material would be too dangerous For too long. 5. There is no radioactive isotope oF nitro- gen.
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This note was uploaded on 08/31/2010 for the course BIO 49810 taught by Professor Satasivan during the Spring '10 term at University of Texas.

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Exam%203-%20Practice%20on%20DNA%20Chapter - Version PREVIEW...

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