311C F09 Exam2PQ - Bio311C Exam 2 Practice Questions...

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Bio311C Exam 2: Practice Questions Multiple Choice. G = a. H-T S b. H+T S c. H- S d. H+T S e. H-T S The hydrolysis of starch to glucose is a spontaneous reaction. However if you dissolve starch in water and keep the solution overnight at room temperature, there is no detectable conversion to glucose. Why? a. The change in free energy of the reaction is positive. b. The activation energy of the reaction is high. c. The change in free energy of the reaction is negative. d. The reaction is endergonic. e. The free energy of the products is higher than the free energy of the reactants. Modes of obtaining nutrition include all of the following except a. chemoautotrophy. b. photoautotrophy. c. heteroautotrophy. d. chemoheterotrophy. e. photoheterotrophy. Which of the following is most true regarding extracellular structures? a. Plasmodesmata in plant cells are similar in function to gap junctions in animal cells. b. The extracellular matrix is composed of cellulose fibers embedded in a glycoprotein matrix. c. The primary and secondary cell walls of plant cells are separated by a sticky middle lamella. d. Gap junctions in animal cells are similar in structure to plasmodesmata in plant cells. e. The extracellular matrix of animal cells and the cell wall of plant cells are formed by endocytosis. Which of the following can best be used to distinguish a plant cell from an animal cell. a. Ability to communicate by direct cell communication. b. Presence or absence of centrosomes. c. Presence or absence of microtubules. d. Ability to transform energy. e. Presence or absence of mitochondria. Steroid hormones such as estrogen act on target cells by a. initiating second messenger activity. b. binding to membrane proteins. c. initiating transcription (making mRNA). d. activating enzymes. e. binding to membrane lipids. The major difference between a cell that responds to a signal and one that does not is the presence of a a. DNA sequence that binds to the signal. b. nearby blood vessel. c. receptor. d. second messenger. e. transduction pathway.
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When a potassium ion (K + ) moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several cellular structures. Which of the following correctly describes the order in which these structures will be encountered by the ion? A) plasma membrane
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311C F09 Exam2PQ - Bio311C Exam 2 Practice Questions...

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