Exam 2 Summer 06 Key MCB181R Dr. Jorstad

Exam 2 Summer 06 Key MCB181R Dr. Jorstad - MCB 181R Summer...

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MCB 181R Summer Session 2006 Instructor: Dr. S. Jorstad Exam II Name _______________KEY_________________ For multiple choice questions , circle all correct answers (there may be more than one). For short essays : confine your answers to the space provided on the scansheet; do not write on the backs of pages; you may use bulleted points to express yourself, as long as your meaning is clear. 1. Cells (life) are distinguished from non-life in that they possess a. the ability to replicate themselves. b. the ability to consume energy. c. the ability to control their contents and maintain homeostasis. d. the ability to move. 2. Although multicellular organism can attain great size, individual cells remain small because a. the capacity of a cell to bring in nutrients and excrete wastes decreases relative to amount of chemical activity possible as potential cell size increases. b. the surface area of a cell increases much more rapidly than volume as cell size increases; the volume can’t keep up with the demands of the surface area. c. diffusion is an adequate means of distributing materials within cells, even if cells grow very large. d. diffusion is not an adequate means of distributing materials within cells when cells grow very large. 3. Cells are able to regulate their contents a. because the plasma membrane is permeable to hydrophilic molecules. b. by using many protein channels that are highly specific. c. because the hydrophobic interior of the membrane repels the hydrophilic molecules that can move freely in aqueous solution. d. by being impermeable. 4. Prokaryotes a. have no membrane. b. have no organelles. c. have no DNA. d. have no nucleus. e. live in a wider range of environmental conditions than eukaryotes. 1
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5. Which of the following statements about the functions of eukaryotic cell structures is/are correct? a. The function of the rough endoplasmic reticulum is the internal support of the cell. b. The function of the Golgi apparatus is storage of genetic information. c. The function of the ribosomes is modification and packaging of newly- synthesized proteins for export from the cell. d. The function of the cytoskeleton is transforming energy for use in the cell. e. The function of vacuoles is storage of water, pigments, toxins, etc. 6. Prokaryotes a. are the most numerous organisms on Earth. b. are generally much larger than eukaryotes. c. are not capable of photosynthesis or cellular respiration. d. are thought to have given rise to eukaryotes through the process of endosymbiosis. 7. Regarding molecular motors, a. dynein motors move the microtubules that make up cilia and flagella; the motor is attached to one set of microtubules and “walks” along an adjacent set of tubules, causing them to whip back and forth. b. kinesin motors carry vesicles or organelles around the cell along
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Exam 2 Summer 06 Key MCB181R Dr. Jorstad - MCB 181R Summer...

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