SampleExam2 - BIOS 101 Dr. Molumby Summer 2001 Exam 3 NAME:...

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BIOS 101 Dr. Molumby NAME: Summer 2001 SECTION #: Exam 3 INSTRUCTOR: Multiple Choice Questions (worth 2 points each) 1. Which are actual evidence supporting the endosymbiotic theory for the origin of eukaryotes? A) fossil evidence suggest early eukaryotes ate proteobacteria B) free-living mitochondria still exist in some environments C) mitochondria and chloroplasts have their own DNA D) all of the above are true E) none of the above are true 2. Which is true about the Miller-Urey experiment? A. Miller and Urey were almost certainly correct about the mixture of gasses present on the early Earth. B. it resulted in the formation of simple amino acids and proteins C. it was the first time living things were produced in a test tube D. A and B are true. E. All of the above are true. 3. Which of the following designs would be the best nature reserve or set of reserves from the point of view of minimizing local extinctions and maximizing species diversity. Assume that each reserve or set of reserves has the same types and amounts of habitats present and draw from the same species pools. A. 1000 small reserves that are each 1 km 2 in area and round in shape B. 1000 small reserves that are each 1 km 2 in area and rectangular in shape C. One single large reserve that is 1000 km 2 in area and round in shape D. One single large reserve that is 1000 km long and 1 km wide 4. Why do scientists think RNA, rather than DNA, may have been the original genetic material? A) Most organisms on Earth use RNA as their genetic material B) The simplest life forms, viruses, use RNA C) RNA is more stable than DNA D) RNA has the ability to catalyze a few simple, chemical reactions E) A and D are correct
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Questions 5-7 refer to the following list of mass-extinction events. A) The Current mass extinction B) The Oxygen Crisis C) The Permian-Triassic mass extinction D) The Cretaceous-Tertiary mass extinction E) More than one of the above 5. Which mass extinction(s) happened early in the proterzoic eon? 6. Which extinction was responsible for the extinction of more than 90% of species at the end of the paleozoic era? 7. The destruction of habitats by agriculture and human engineering is relevant to which mass extinction? For questions 8-11, match the description of the event with one of the following types of mutation. A) substitution B) insertion C) deletion D) duplication E) transposition 8. An A-T base pair is spontaneously replaced with a G-C base pair 9. A retrovirus incorporates itself into the host’s genome, adding a 1,400 base pair sequence to the G6PDH gene of the target tissue. 10. Because of an error in DNA replication, a worm produces gametes that have two copies of the hemocyanin gene rather than one. Questions 11-15 apply to the following mechanisms of evolution.
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SampleExam2 - BIOS 101 Dr. Molumby Summer 2001 Exam 3 NAME:...

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