311C F10 Exam2PQ

311C F10 Exam2PQ - Bio311C Exam 2 Practice Questions...

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Bio311C Exam 2: Practice Questions Multiple Choice. 1. ∆ G = a. H-T S b. H+T S c. H- S d. H+T S e. H-T S 2. 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. 3. 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. 4. 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. 5. 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. 6. 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. 7. 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 primary cell wall cytoplasm vacuole B) secondary cell wall plasma membrane primary cell wall cytoplasm vacuole C) primary cell wall plasma membrane cytoplasm vacuole D) secondary cell wall primary cell wall plasma membrane cytoplasm vacuole E) plasma membrane primary cell wall secondary cell wall cytoplasm vacuole 8. Choose the answer that best describes anabolic and catabolic pathways. a.
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This note was uploaded on 11/10/2011 for the course HDF 304 taught by Professor Gray during the Spring '08 term at University of Texas.

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311C F10 Exam2PQ - Bio311C Exam 2 Practice Questions...

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