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oldfinalkey2 - Name: _ Bis098-400 (Bis2A Pilot) SID: _...

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Name: _____________________________ SID: _____________________________ Bis098-400 (Bis2A Pilot) Final Exam March 16, 2007 Write name, SID, and answers on Scantron 1. Which of the following statements is correct? A. Multicellular organisms can use all the same sources of energy as single-celled organisms, plus also some other sources of energy that are not available to single-cell organisms. B. Multicellularity evolved only once in the history of life on Earth. C. Multicellular organisms have evolved many times from single-cell ancestors. D. A and B. E. A and C. 2. Which of the following does NOT support the endosymbiotic theory: A. Mitochondria and chloroplasts have circular genomes that do not contain histones. B. Mitochondria and chloroplasts have a double-membrane C. Mitochondria have a variant genetic code different from both bacteria and eukaryotes D. Mitochondria and chloroplasts are about the size of a bacterium E. B and C 3. Phospholipids are amphiphilic, having both hydrophilic and hydrophobic parts. The significance of this to the formation of first cells is: A. Spontaneous formation of an enclosed system B. Phospholipids will keep polar molecules out C. Phospholipids will keep hydrophobic molecules out D. All of the above E. None of the above 4. What functions do transmembrane proteins perform in the cell? A. Connecting cytoskeleton to the extracellular matrix. B. Regulating gene expression in response to extracellular signals C. Regulating the flow of ions across the membrane. D. A and B E. A, B, and C. 5. Modern cells are units --- A. Capable of replication (division) B. Enclosed by a membrane C. Able to perform essential metabolic functions. D. A and B E. All of the above
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6. Bacteria are similar to multi-cellular organisms in that: A. They can exist in communities B. They can live and grow naturally as independent single cells C. They can alter gene expression in response to environmental signals. D. A and C E. All of the above 7. Both prokaryotic and eukaryotic genomes have DNA molecules that are considerably longer then the cells (or organelles) that contain them, but they have evolved different strategies to deal with this problem. Which of the following statements is NOT TRUE A. Prokaryotes rely on supercoiling to package their DNA B. Prokaryotes have histones C. Eukaryotes rely on higher order chromatin packaging D. Eukaryotes have histones E. Both rely on catalysts to carry out this packaging 8. Prokaryotes exist in every imaginable environment on earth including freshwater and high salinity. How do these organisms deal with these extremes in osmolarity? A. Prokaryotes have cell walls B. Prokaryotes have pumps and channels to balance salt C. Prokaryotes synthesize compounds to balance osmolarity D. A and B E. All of the above (ABC) 9. Genetic drift is the process by which the frequency of various alleles (forms of a gene) change over time due to random processes (sampling errors – stochastic death). Consider the following statements and indicate which one is
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This note was uploaded on 07/03/2009 for the course BIS 64982 taught by Professor Comai during the Spring '09 term at UC Davis.

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oldfinalkey2 - Name: _ Bis098-400 (Bis2A Pilot) SID: _...

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