Practice Questions key rev

Practice Questions key rev - Key to BIO 113 AU2011 DING...

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Key to BIO 113 AU2011 DING Practice Questions ( Correct answers are boldfaced ) There may be more than one correct answer to some questions. 1. The subatomic particles that do not play a major role in chemical reactions are: a. Neutrons b. Electrons in all inner shells c. Protons d. Electrons in outermost or valence shell e. Ions 2. Covalent bonds between two reacting atoms are formed by a. Transferring electrons from one atom to the other. b. Sharing electrons between the two atoms. c. Van der Waals interactions. d. Sharing hydrogen between two electrons. 3. Water can dissolve NaCl, DNA, sugars and hydrophilic proteins because a. Its oxygen atom is slightly positive and hydrogen slightly negative in electrical charges. b. Its oxygen atom is slightly negative and hydrogen slightly positive in electrical charges. c. It is nonpolar because the oxygen atom is saturated by two hydrogens. 4. Water cannot dissolve lipids because a. Its oxygen atom is slightly positive and hydrogen slightly negative in electrical charges. b. Its oxygen atom is slightly negative and hydrogen slightly positive in electrical charges. c. It is nonpolar because the oxygen atom is saturated by two hydrogens. 5. Functional groups serve the following functions: a. Enhancing hydrophilicity and chemical reactivity of a molecule b. Enhancing hydrophobicity and chemical reactivity of a molecule c. Enhancing potential energy and free energy therefore reactivity of a molecule d. Reducing activation energy of the substrates. 6. “-CH 3 ” attached to a DNA sequence or a protein sequence represents a. a carbonyl group b. an amino group c. a carboxyl group d. a methyl group 7. Peptide bonds in the protein sucrase, which catalyzes breakdown of sucrose to glucose and fructose, are formed between a. a carboxyl group and phosphate group b. a carboxyl group and a hydroxyl group c. a phosphate group and a hydroxyl group
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This note was uploaded on 01/05/2012 for the course BIO 113 taught by Professor Swenson during the Fall '08 term at Ohio State.

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Practice Questions key rev - Key to BIO 113 AU2011 DING...

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