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D erythrocytes pump water inward by active transport

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Unformatted text preview: ard by active transport to balance osmotic gradients. (E) Water is a universal solvent and simply dissolves the erythrocyte membranes. 3. The addition of -amanitin, a known inhibitor of DNA-dependent mRNA synthesis, to growing cells will most likely cause protein synthesis to (A) (B) (C) (D) (E) stop immediately stop as mRNA becomes depleted stop as thymidine becomes depleted stop as the ribosomes become inactivated be unaffected 7. Which of the following is true of the polymerase chain reaction? (A) It enables a small amount of DNA to be amplified. (B) It involves the addition of a poly-A sequence to mRNA. (C) It cuts DNA into numerous small fragments for analysis. (D) It separates DNA fragments according to size. (E) It requires RNA in order to proceed. 8. Which of the following pathways is most likely taken by newly synthesized histones? (A) Rough endoplasmic reticulum → Golgi complex → secretory vesicle (B) Rough endoplasmic reticulum → Golgi complex → nucleus (C) Rough endoplasmic reticulum → smooth endoplasmic reticulum → nucleus (D) Cytoplasm → nucleus (E) Cytoplasm → rough endoplasmic reticulum → Golgi complex → nucleus 4. An infectious agent that appears to have no nucleic acid is a (A) (B) (C) (D) () (E) bacterium bacteriophage viroid virus po prion Unauthorized copying or reuse of any part of this page is illegal. GO ON TO THE NEXT PAGE. 15 9. How many different types of gametes could be produced by an individual with the arbitrary genotype of AAbbCCDdEe ? (A) (B) (C) (D) (E) Two Four Six Eight More than eight 13. Which of the following is correct concerning the Km of an enzyme? (A) It depends on the dissociation constant for the product of the reaction. (B) It defines the Vmax of the enzyme-catalyzed reaction. (C) It is a measure of the number of substrate molecules converted to product in a specific unit of time. (D) It is the substrate concentration at which the velocity of the reaction is equal to 1/2 Vmax. (E) It is measured in units of moles per minute. 14. Which of the following types of enzymes are usually subjected to direct feedback inhibition by an intracellular metabolite? (A) Enzymes catalyzing the last step in a catabolic pathway (B) Enzymes catalyzing the last step in a biosynthetic pathway (C) Enzymes catalyzing the first step in a biosynthetic pathway (D) Enzymes localized in the extracellular matrix (E) Enzymes localized in lysosomes 15. Which of the following cellular structures serve similar functions in plants and animals, respectively? Plants (A) (B) (C) (D) (E) Tight junctions Desmosomes Plasmodesmata Plasmodesmata Plasmodesmata Animals Gap junctions Gap junctions Gap junctions Desmosomes Tight junctions 10. During cytokinesis in an animal cell, a constricting ring pinches the dividing cell into the two daughter cells. This contractile ring is formed by which of the following structures? (A) (B) (C) (D) (E) Centrioles Microtubules Microfilaments Z discs The spindle apparatus 11. If an organic acid accumulates in a plant cell in sufficient quantities to affect the cell’s pH significantly, then the acid will probably be stored in the (A) (B) (C) (D) (E) cytosol vacuole nucleus mitochondria chloroplasts 12. Which of...
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This document was uploaded on 03/16/2014 for the course BIO 1434 at UT Arlington.

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