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Material Type: Quiz; Professor: Gee; Class: Princ. of Biology- for majors; Subject: Biology; University: East Carolina University; Term: Spring 2011;
Typology: Quizzes
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B_______ 1) Which of the following cell types is likely to contain tight junctions? A. red blood cells that travel singly through the circulatory system B. cells lining the stomach, which prevent nutrients from leaking out C. muscle cells in which the intermediate filaments of the cytoskeleton are bound to each other D. cells of water-transporting tissue in plant stems A_______ 2) Sponges are among the most ancient groups of animals. They have only a few cell types and relatively simple bodies. If the cells of adult sponges from differently pigmented species A, B, and C were dissociated and then mixed together in a culture dish, what would happen? A. Adult sponges will re-form into species A, B, and C. B. Adult sponges with a mixture of different pigmented cells will re-form. C. The cells will remain dissociated. D. The dissociated sponge cells will produce antibodies against the foreign sponge cells. C_______3) Which of the following statements is false? A) When plant cells are growing, they release expansins, which are enzymes that can expand the primary cell wall. B) The secondary cell wall often contains structural components, like lignin, that form a relatively rigid and complex network within the cell wall. C) A plant cell continues growing after the secondary cell wall forms but stops growing with the formation of the tertiary cell wall. D) Pectin is a component of the cell wall that attracts and holds water. D_______4) Pemphigus vulgaris is an autoimmune disorder in humans in which antibodies are produced against the cadherins of desmosomes. The blistering of the skin and mucous membranes characteristic of this disorder is probably a result of _____. A) a decrease in flexibility of the cell membrane B) an inadequate number of G-protein receptors C) inadequate production of cytoskeletal proteins D) a loss in cell-cell adhesion B_______5) Acetylcholine is a neurotransmitter that binds to receptors on skeletal muscle cells. The receptor-signal complex brings about a series of events that result in contraction of skeletal muscle. Venom from black widow spiders causes an explosive release of acetylcholine. What would that do to its victims? A) The victim's muscles would be unable to contract. B) The victim's muscles would be unable to relax. C) The victim's cell receptors would no longer be able to bind regulatory hormones. D) The victim's cell receptors would be able to bind regulatory hormones but at a rate greatly exceeding normal rates. C_______6) Protein kinase is an enzyme that _____. A) functions as a second messenger molecule B) serves as a receptor for various signal molecules C) activates or inactivates other proteins by adding a phosphate group to them D) activates or inactivates other proteins by removing a phosphate group from them A_______7) A G-protein receptor with GTP bound to it _____. A) is in its active state B) signals a protein to maintain its shape and conformation C) will use cGMP as a second messenger D) is in its inactive state B_______8) Plasmodesmata are cell-cell junctions that are found between _____. A) individual cardiac cells in heart muscle tissue B) adjacent plant cells C) adjacent animal cells in the same tissue type D) the plasma membrane of actively dividing prokaryotes C_______9) Put the steps of the process of signal transduction in the order they occur: