Midterm 2011W

B random pairing of heavy and light chains c

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Unformatted text preview: pairing of heavy and light chains. C. rearrangement of the DNA-encoding antibody gene segments. D. terminal polymerase addition of extra nucleotides. E. the generation of different codons during antibody gene splicing. 27. Which of the following statements is FALSE? A. Dark muscle fibers have more myoglobin and mitochondria than light fibers. B. Twitches sum at high frequencies of stimulation because Ca2+ ions are continuously present in the sarcoplasmic reticulum. C. Oxidative phosphorylation occurs only under aerobic conditions. D. Anaerobic exercise increases muscle mass but aerobic exercise builds endurance. E. All the statements are correct. MCDB 1B Midterm Green (2) Version: 2 Page: 4 28. Which of the following is not a complication of diabetes? A. Retinopathy. B. Excess glycogen storage. C. Nephropathy D. Ketoacidosis. E. Excess urine production. Match the eye structure on the left with its characteristic on the right. (Answers on the right may be used more than once or not at all, but choose only 1 answer for each question). These are worth 1 point each. A. Contains the photoreceptors 29. Iris D B. Contains only cone cells 30. Retina A B C. Contains only rod cells 31. Fovea D. Controls the amount of light entering the eye E. Helps the eye to focus 32. Which of the following is NOT true about helper T cells? A. They carry both MHC class I and II molecules. B. They are derived from the lymphoid progenitor cells. C. They function in cell-mediated and humoral responses. D. They bear surface CD4 molecules. E. They cannot kill pathogens, but secrete cytokines. Match the muscle type on the left with its characteristic on the right. (Answers on the right may be used more than once or not at all, but choose only 1 answer for each question). These matchings are worth 1 point each. A. Always under our voluntary control 33. Smooth C B. Consists of giant multinucleated cells 34. Striated A C. Are always found in internal organs 35. Cardiac D D. Controlled by the autonomic nervous system E. Contains inte...
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