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Unformatted text preview: Version Final Exam Sathasivan (49810) 1 This print-out should have 73 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Write your name legibly in both the exam and Scantron. 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. Compared to phosphate there are more nitrogens in a nucleotide, so the latter are more radioactive. 2. Amino acids and thus proteins also have nitrogen atoms; thus the radioactivity would not distinguish between DNA and proteins. correct 3. There is no radioactive isotope of nitro- gen. 4. Radioactive nitrogen has a half-life of 100,000 years and the material would be too dangerous for too long. 5. Meselson and Stahl already did this ex- periment. Explanation: If nitrogen is labeled, the radioactivity be- tween DNA and proteins cannot be distin- guished and as such the experiment as pro- posed by the students would not succeed. 002 10.0 points A single hair is found at the scene of a crime. Which technology would you use first to de- termine if the hair could have come from a certain suspect? 1. Antisense RNA 2. DNA sequencing 3. Probing 4. PCR correct 5. Fragment cloning Explanation: 003 10.0 points Cellulose is the most abundant organic com- pound on Earth. Its main function is 1. as a component of biological mem- branes. 2. as a storage compound for energy in plant cells. 3. to provide mechanical strength to plant cell walls. correct 4. to store genetic information. 5. as a storage compound for energy in ani- mal cells. Explanation: 004 10.0 points Peroxisomes in animal cells and glyoxosomes in plant cells are examples of 1. microbodies. correct 2. nucleosomes. 3. ribosomes. 4. chromosomes. 5. lysosomes. Explanation: Recall 005 10.0 points You look at the label on a container of short- ening and see hydrogenated vegetable oil. This means that during processing the num- Version Final Exam Sathasivan (49810) 2 ber of carbon-carbon double bonds in the oil was decreased. What is the result of decreas- ing the number of double bonds? 1. There are more kinks in the fatty acid chains. 2. The fatty acid is now a triglyceride. 3. The oil is now a solid at room tempera- ture. correct 4. The oil now has a lower melting point. 5. The oil is now a derivative carbohydrate. Explanation: 006 10.0 points A paramecium must constantly pump out wa- ter to keep from bursting....
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