Bio93midtermC+A

Bio93midtermC+A - Name Student Bio93 Midterm Fall 2005 C-2...

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Name Student # Pts.__________ 1 Bio93 Midterm Fall 2005 C-2
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Name Student # Pts.__________ 2 1. Ribosomes synthesize proteins. Which of the following is NOT correct? a. Ribosomes are present in mitochondria and Golgi b. Ribosomal subunits are assembled in the nucleolus c. mRNA associates with ribosomes in the cytoplasm d. Chaperone proteins help fold newly synthesized proteins e. Ribosomes contain both proteins and nucleic acids 2. Which of the following is not a characteristic of G-protein receptors? a. Ligands include hormones and neurotransmitters. b. Activation of the receptor promotes GDP-GTP exchange on the coupled G-protein c. They are typically activated by dimerization d. They are located on the plasma membrane e. Ligand binding induces a conformational change in the receptor 3. Which of these correctly describes the flow of information or cellular traffic in a eukaryotic cell? (1 point) a. DNA protein RNA b. rER Golgi lysosome c. Golgi rER smooth ER d. RNA DNA protein e. Vesicles smooth ER peroxisome 4. Which of the following is a property of water? (1 point) a. It is a good buffer b. It is a good solvent of biological molecules c. It is a strong base d. It forms ionic bonds with other water molecules e. It is a nonpolar molecule 5. Choose the statement(s) that best describe(s) signal transduction across a cellular membrane. a. Most signals are received by cell surface receptors. b. Amplification of the signal frequently occurs on the inside of the cell. c. Membrane receptors have mechanisms for both activation and inactivation d. A and B e. All of the above
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Name Student # Pts.__________ 3 6. Which of the following movement involves active transport across a membrane? a. Passage of hydrophobic molecules into a cell. b. Water movement into the nucleus via the nuclear pore c. Sucrose passage into a cell via a sucrose-H + cotransporter. d. Facilitated diffusion of a solute. e. Water movement across the plasma membrane via aquaporin channels. 7. Which of these statements is false? a. Mitochondria and chloroplasts contain ribosomes. b. Lysosomes degrade damaged organelles c. Mitochondrial ribomomes synthesize only mitochondrial proteins d. Pinocytosis is mediated by coated vesicles e. Centrioles are microtuble organizing centers. 8. Which of the following is found in prokaryotes (bacteria). a. Nuclear membrane b. Cell wall c. Golgi apparatus d. Mitochondria e. rER 9. Which of the following is NOT a function of the cytoskeleton. (1 point) a. Muscle contraction b. Formation of nuclear lamina c. Organelle movement d. Movement of cations and anions in and out of the cell.
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Bio93midtermC+A - Name Student Bio93 Midterm Fall 2005 C-2...

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