Principles of biology I Exam2 f05

Principles of biology I Exam2 f05 - Principles of Biology I...

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Principles of Biology I Name:_____________________________ Exam II, FALL ‘05 Remember to read all of the possible answers for each question before choosing the BEST ANSWER. 1. Random motion causes a net movement of substances dissolved in water from regions where their concentration is high to regions where their concentration is lower. This process is called: a. active transport. b. osmosis. c. diffusion. d. facilitated diffusion. e. selective permeability. 2. Glucose in the bloodstream is allowed to enter red blood cells. This process does not require energy, is specific for glucose (other sugars cannot enter via this pathway) and the net movement is of glucose from the bloodstream (where it is at a relatively high concentration) into the cell (where the concentration is lower). This process is most likely to be an example of: a. active transport. b. osmosis. c. diffusion. d. facilitated diffusion. e. coupled transport. 3. A cell takes up sugar molecules from the surrounding fluid. Upon further study it is determined that 1) the sugar concentration in the cell is already higher than that of the surrounding medium, yet the cell continues to be able to take up more and 2) as each sugar molecule is taken up a molecule of sodium is also allowed to enter the cell. This process is likely to be an example of: a. active transport. b. coupled transport. c. diffusion. d. facilitated diffusion. e. endocytosis. 4. An intracellular receptor that, when activated, regulates the expression of a gene in the nucleus will likely have all but which of the following binding sites and/or domains? a. DNA binding domain. b. hormone (signal) binding domain. c. transcription activating domain. d. Inhibitor binding site. e. Such a receptor would likely have all four of the above sites/domains.
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5. As a scientist you very carefully inject a small water-soluble blue dye molecule into a single cell of a piece of living human tissue. After a while you note that it has spread into adjacent cells. This most likely occurred because of a. active transport. b. gap junctions. c. tight junctions. d. osmosis. e. plasmodesmata. 6. A signal molecule released by one cell binds to receptors on target cells only in the immediate “neighborhood” and does not enter the blood stream. This is an example of: a. autocrine signaling. b. exocrine signaling. c. direct contact signaling. d. synaptic signaling. e. paracrine signaling. 7. Protein kinase cascades are often involved in: a. cell surface recognition. b.
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This test prep was uploaded on 02/20/2008 for the course BIOL 1 taught by Professor Staff during the Fall '05 term at North Texas.

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Principles of biology I Exam2 f05 - Principles of Biology I...

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