Exam1V1-1 - KEY Biology 182R John Pepper/Kevin Bonine/Peter...

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* KEY * Biology 182R John Pepper/Kevin Bonine/Peter Chesson LECTURE SECTIONS TH 3:30 PM – 4:45 PM MIDTERM ONE FEBRUARY 19, 2008 STUDENT NAME:_______________________________________________________ Print Last Name First Name USE A NUMBER TWO PENCIL, NO PEN! 1. When biologists assembled the phylogenetic tree of life, they discovered that: a. Life has begun multiple times on earth, leading to the different kingdoms of life. * b. All life is part of one great tree, showing that it all descended from a single common ancestor long ago. c. Some organisms cannot be organized into phylogenies d. All organisms can be organized onto phylogenies, but the different phylogenies cannot be joined together. 2. Which statement is FALSE? a. The coal we mine for energy today comes from fossilized forests from the Carboniferous period. * b. After the half-life of 14C has passed twice, a dead organism has 25% of it’s carbon in the 14C form. c. In the Precambrian era, oxygen levels were much lower than they are now. d. Arthropods such as scorpions appeared earlier than mammals. 3. Evidence for the history of life does NOT include a. analysis of how fossils fit in with geological strata. b. any fossils of microbes or soft-bodied invertebrates. * c. carbon dating of fossils that are millions of years old. d. the DNA of living organisms 4. Which of the following is NOT evidence of a meteor collision? a. high concentrations of iridium, such as that in the rock layer separating the Cretaceous and Tertiary periods b. craters * c. sudden appearance of completely new kinds of fossils, such as land animals d. disfigured rocks or rocks with unusual isotopic ratios
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5. A living fossil is a a. fossil that contains undamaged DNA. * b. a species that is still living that has changed very little over a long period of evolutionary history. c. fossil of a species that is still around today. d. species that has gone extinct very recently. 6. The appearance of multicellular organisms coincided with increased levels of _______ in Earth’s atmosphere. a. nitrogen b. hydrogen c. carbon dioxide * d. oxygen 7. The Cenozoic era (66 mya–present) is often called the age of a. bacteria, because they cause so many diseases. b. viruses, because viruses such as AIDS have evolved recently. c. plants, because they convert radiant energy from the sun into chemical energy. * d. mammals, because of the extensive diversification of this group. 8. The major groups of animals that have species living today first appeared in which era? a. Jurassic * b. Cambrian c. Precambrian d. Carboniferous 9. Today, the strongest force driving the direction of evolution is… a. genetic modification of organisms in the lab. b. no strong force: evolution today is very slow.
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Exam1V1-1 - KEY Biology 182R John Pepper/Kevin Bonine/Peter...

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