Exam 1 - 1) Which of the following would not be a good...

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1) Which of the following would not be a good reason for studying ribosomal RNA to understand the major branches in the evolutionary history of life? A. This molecule is found in every species B. It is passed on through evolutionary history with only minor modifications C. It is a necessary part of the cellular machinery for reproduction and other purposes. D. It mutates very frequently. 2) How many electrons are involved in a triple covalent bond? A. two B. three C. six D. nine 3) What can you infer about large molecular-weight proteins that cannot be transported into the nucleus? A. They are foreign proteins B. They lack a nuclear localization signal (NLS). C. They are defective proteins. D. They have been tagged for destruction. 4) Which of the following represents a major difference between prokaryotic cells and eukaryotic cells? A. Prokaryotes, not eukaryotes, have cell walls. B. Eukaryotic cells tend to have much more extensive inner membrane systems and larger numbers of intracellular organelles than do prokaryotes. C. Prokaryotes are unable to carry out aerobic respiration. D. Prokaryotes are a more homogenous group of organisms than are eukaryotes, which include protozoa, plants, and animals. 5) Why do many researchers consider RNA to be the best candidate for the first lifeform? A. It is simple in structure. B. It is capable of self-replication and catalysis. C. It carries more information than any other molecule. D. All of its nucleotide components have been created under laboratory conditions that mimic early Earth.
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five-carbon backbone of compound #1. Compound #1 Compound #2 O O ll ll C– O- C–O- l l H– CH O H–CH l ll l H– C ---O- ------ H–CH l l HO-CH C=O l l C –O- C –O- ll ll O O A. Carbon backbone is oxidized. B. Carbon backbone is reduced C. There is no electron transfer. 7) In high salt environments, which type of interaction in proteins is weakened? A. Hydrogen bonds B. Disulfide bridges C. Van der Waals interactions D. Ionic bonds 8) Which statement about spontaneous generation is false? A. Pasteur demonstrated that it does not occur under normal laboratory conditions. B. It apparently occurred at least once-when life on Earth began. C. It occurs every time a new species evolves from a preexisting species. D. It addresses the formation of living cells from previously nonliving material. 9) Which of the following means of transport would most likely be used for moving a H+ proton from a low concentration in the cytosol of a cell to a high concentration in Iysosomes? A. facilitated diffusion through an ion channel protein B. facilitated diffusion through a transporter protein C. active transport through a "pump" protein D. passive transport 10) Which of the following substances would most likely require a protein to facilitate its diffusion across a cell membrane? A.
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This note was uploaded on 12/06/2009 for the course BIO 172 taught by Professor Clark during the Winter '08 term at University of Michigan.

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Exam 1 - 1) Which of the following would not be a good...

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