3022BB3Ed01 - Lehninger Biochemistry 4e Ch 01 1 A dynamic...

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Lehninger Biochemistry 4e Ch 01 1.. A dynamic steady state results when A. a molecule stops being degraded. B. an organism is at equilibrium with its surroundings. C. there is no net energy transfer. D. the rate of intake or synthesis of a molecule equals the rate of its disappearance. 2. An open system is one A. that exchanges neither matter nor energy with its surroundings. B. that exchanges energy but not matter with its surroundings. C. that exchanges both matter and energy with its surroundings. D. that exchanges matter but not energy with its surroundings. 3. Which of the following is true about the energy from sunlight? A. All organisms obtain their energy directly from the radiant energy of sunlight. B. Photosynthetic cells use light energy to drive electrons from one molecule to another. C. Energy from sunlight is given off in nuclear fission reactions in the sun. D. Photosynthetic cells absorb light energy and use it to break down compounds such as starch and sucrose. 4. Which of the following is true about carbon bonding? A. Carbon-carbon double bonds have freedom of rotation. B. Carbon atoms can form covalent bonds with up to four other atoms. C. Carbon can form double bonds with hydrogen. D. Carbon-carbon single bonds cannot rotate. 5. The amino acid alanine, shown below, contains all of the following functional groups except A. an amino group. B. a methyl group. Incorrect. C. an ester group. D. a carboxyl group. 6. Which of the following is true about the two molecules shown below? A. They have the same configuration. B. They are cis-trans isomers. C. They are enantiomers of each other. D. They are diastereomers of each other. 7. Which of the following is true about the two molecules shown above? A. They are geometric isomers. B. The carbon double bonds in each are chiral centers. C. Fumaric acid is a cis-isomer of maleic acid. D. They can be interconverted without breaking any covalent bonds. 8. The difference between phototrophs and chemotrophs is A. whether they are aeorbic or anaerobic. B. their energy source. C. their source of carbon. D. whether they are prokaryotic or eukaryotic. 9. Prokaryotic and eukaryotic cells possess which of the following? A. a cytoskeleton B. a nuclear envelope C. mitochondria D. a plasma membrane 10. Exergonic and endergonic reactions differ in that A. exergonic reactions have a positive free energy change (
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G is positive) and endergonic reactions have a negative free energy change ( G is negative). B. exergonic reactions require an input of energy and endergonic reactions release free energy. C. exergonic reactions produce products with less free energy than the reactants; endergonic reactions produce products with more free energy than the reactants. D. exergonic reactions consume more free energy than is
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This note was uploaded on 11/07/2010 for the course CHEM chem taught by Professor Stean during the Spring '10 term at McCann School of Business and Technology.

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3022BB3Ed01 - Lehninger Biochemistry 4e Ch 01 1 A dynamic...

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