BS111 MidTermII_form_B

BS111 MidTermII_form_B - Name: _ Date: _ Form A 1....

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Name: __________________________ Date: _____________ Form A 1. Structures that contain networks of keratin fibers and provide mechanical stability to epithelial tissues are called A) extracellular matrices. B) glycoproteins. C) gap junctions. D) desmosomes. E) phospholipid bilayers. 2. ATP is A) a short-term energy-storage compound. B) the cell's principal compound for energy transfers. C) synthesized mostly within mitochondria. D) A molecule all living cells rely on to do work. E) All of the above 3. The bacterium Vibrio cholerae cause cholera. Which is the follow best explains the toxic nature of this bacteria. A) The Toxin released by it interferes with the cells electron train transport system. B) Dehydration caused by the process of osomosis cells lose water due to a depletion of salt in the interior of the cells. C) Dehydration caused by the process of osomosis cells lose water due to a increase of salt in the interior of the cells. D) Carrier proteins bring in toxins which then stop the host's cells replication apparatus. 4. The low pH of the intermembrane space of the Mitochondrion is due to: A) Na+ B) Hypertonic solution. C) the presence of NADH + H+ D) A high concentration of H+ 5. Which statement about feedback inhibition of enzymes is not true? A) It is exerted through allosteric effects. B) It is directed at the enzyme that catalyzes the first committed step in a metabolic pathway. C) It is an example of irreversible inhibition. D) It affects the rate of reaction, not the concentration of enzyme. Page 1
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6. Channel proteins allow ions that would not normally pass through the cell membrane to pass through via the channel. What properties of the proteins are responsible for this? A) The channels are often composed of polar amino acid groups. B) The channels are often composed of hydrophobic amino acid groups. C) Both a and b D) None of the above 7. Which statement about osmosis is not true? A) It obeys the laws of diffusion. B) In animal tissues, water moves into cells if they are hypertonic to their environment. C) Red blood cells must be kept in a plasma that is hypotonic to the cells. D) Two cells with identical solute concentrations are isotonic to each other. E) Solute concentration is the principal factor in osmosis. 8. Which statement about oxidative phosphorylation is not true? A) It is the formation of ATP by the electron transport chain. B) It is brought about by chemiosmosis. C) It requires aerobic conditions. D) It takes place in mitochondria. E) Its functions can be served equally well without Cytochrome c. 9. The "Fluid mosaic" model of cell membranes depicts the cell membrane as a A) highly static substance that is very homogeneous. B)
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This note was uploaded on 03/25/2008 for the course BS 111 taught by Professor Patterson during the Fall '05 term at Michigan State University.

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BS111 MidTermII_form_B - Name: _ Date: _ Form A 1....

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