PracticeExam2 - Fall 2008 BIO 202 Practice Midterm Exam 2...

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Fall 2008 BIO 202 Practice Midterm Exam 2 P a ge 1 1) The symptoms of a certain inherited disorder in humans include male sterility. Which of the following is a reasonable hypothesis for the molecular basis of this disorder? a) a defective enzyme in the mitochondria b) defective actin molecules in cellular microfilaments c) defective dynein molecules in flagella d) abnormal hydrolytic enzymes in the lysosomes e) defective ribosome assembly in the nucleolus 2) Where is calcium stored inside cells? a) nucleus b) ER c) centrioles d) ribosomes e) calcium depository granules 3) ________ allow a bacterium to move. a) Cell walls b) Celia c) Ribosomes d) Mitochondria e) Microvilli 4) Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through a) plasmodesmata. b) intermediate filaments. c) tight junctions. d) desmosomes. e) gap junctions. 5) 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 => tonoplast b) secondary cell wall => plasma membrane => primary cell wall => cytoplasm => tonoplast c) primary cell wall => secondary cell wall => plasma membrane => cytoplasm => tonoplast d) primary cell wall => plasma membrane => tonoplast => cytoplasm => vacuole e) tonoplast => primary cell wall => plasma membrane => cytoplasm 6) The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is not a characteristic of all of these extracellular structures? a) They must be highly permeable to water and small molecules in order to allow cells to exchange matter and energy with their environment. b) They must permit information transfer between the cell's external environment and the cytoplasm. c) They must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume. d) They are constructed of materials that are largely synthesized in the cytoplasm and then transported out of the cell. e) They are composed of a mixture of proteins and carbohydrates. 7) All of the following serve an important role in determining or maintaining the structure of plant cells. Which of the following are distinct from the others in terms of composition? a) microtubules b) microfilaments c) plant cell walls d) intermediate filaments e) nuclear lamina 8) Which of the following statements about the cytoskeleton is incorrect? a) The dynamic aspect of cytoskeletal function is made possible by the assembly and disassembly of a few simple types of proteins into large aggregates. b) Microfilaments are structurally rigid and resist compression, while microtubules resist tension
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PracticeExam2 - Fall 2008 BIO 202 Practice Midterm Exam 2...

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