Exam1sept07 - Bio 311C Exam 1 September 25, 2007 (50 pts MC...

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Bio 311C Exam 1 Name_______________________________________ September 25, 2007 (50 pts MC + 50 pts written pages) UT EID_____________________________________ Multiple Choice (2 pts each). Choose the one best answer and enter it here and on your scan form . 1______Select the statement that best describes a polar covalent bond. (A) A hydrogen bond is one example of a polar covalent bond. (B) A polar covalent bond is between oppositely charged units. (C) Bonding between carbon and hydrogen represents a typical polar covalent bond. (D) Electron sharing is unequal between the atoms. (E) Many polar covalent bonds occur in hydrophobic molecules. 2______Which two properties of water help it to moderate changes in temperature? (A) Formation of hydration shells and high specific heat (B) High heat of vaporization and exclusion of hydrophobic substances (C) High specific heat and high heat of vaporization (D) Formation of hydration shells and exclusion of hydrophobic substances 3______Carbon atoms serve as backbones for a variety of biological molecules largely because of: (A) the ability of carbon atoms to form four covalent bonds (B) the ability of carbon atoms to form ionic bonds with many atoms (C) the ability of carbon to form hydrogen bonds with many different atoms (D) the abundance of carbon in the atmosphere (E) the high electronegativity of carbon 4______ Cola has a pH of 3 and black coffee has a pH of 5. How many times more concentrated are the hydrogen ions (H+) in cola than in black coffee? (A) 2 (B) 10 (C) 15 (D) 100 5.___Multicellular organisms are composed of many small cells rather than fewer large ones because (A) Larger cells require more cell-cell junctions. (B) Larger cells have more surface area for diffusion (C) Smaller cells have a greater surface-volume ratio (D) The total volume of the organism is the limiting factor (E) More cell wall material is required for large cells. 6._____ The basic structure of eukaryotic cilia and flagella consists of ______ covered with a membrane sheath. (A) flagellin fibers (B) spindle fibers (C) microfilaments (D) intermediate filaments (E) microtubules 7.______ The ionic bond of sodium chloride is formed when (A) sodium and chlorine share an electron pair. (B) sodium and chlorine both lose electrons from their outer valence shells. (C) sodium gains an electron from chlorine. (D) chlorine gains an electron from sodium. (E) sodium gains a proton from chlorine.
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For items 8-10, choose from this list: (A) N-H bond; (B) C-H bond; (C) O-H bond; (D) S-H bond 8._____When attached to a carbon chain, this group is most likely to form an ion. 9_____ When at the end of an amino acid R group is most likely to be in a hydrophobic interaction
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This note was uploaded on 03/19/2008 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas at Austin.

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Exam1sept07 - Bio 311C Exam 1 September 25, 2007 (50 pts MC...

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