Practice Midterm I Key

Practice Midterm I Key - LS3 MIDTERM I Practice Exam (10...

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LS3 MIDTERM I Practice Exam (10 pts) 1. In Griffith’s transformation experiment, he heat killed the S strain, mixed it with a small number of R strain cells and injected a mouse (please answer the following with one or two words). a) What happened to the mouse? It died. ( +2 ) b) What type of cell was isolated from the mouse’s lungs? S cells ( +2 ) c) If Griffith had heat killed the R strain and mixed it with a small amount of S strain cells, what would you predict would happen to the mouse? It would die. ( +2 ) d) What type of cells would you expect to find in the mouse’s lungs? S cells, the R cells would be destroyed by the immune system. ( +2 ) e) If this second experiment were done in vitro (in a test tube), and the cells plated on media, what types of colonies might you expect to find? Mostly smooth colonies, but a few R colonies as well. ( +2 ) (12 pts) 2. Amino acids form the building blocks for proteins. a) Using the one letter code, name the acidic amino acids and state what functional group makes them acidic. D, E; carboxyl group ( +3 ) b) Using the one letter code, name the polar neutral amino acids and state what functional group makes each amino acid polar. S, T, Y: hydroxyl group
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Practice Midterm I Key - LS3 MIDTERM I Practice Exam (10...

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