Exam_1_2007solution - Exam 1 BME 365R October 3 2007...

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1 Exam 1 BME 365R October 3 2007 Problem 1: Which of the following is NOT one of the four classes of biomolecules in physiological systems? A) carbohydrates B) lipids C) starches D) proteins E) nucleotides Answer: C Problem 2: Cholesterol is transported in the blood A) by attaching to a hydrophilic molecule, such as a lipoprotein. B) in low enough quantities so that there are no problems. C) in groups with other hydrophobic molecules, such as fatty acids. D) by binding an anion, such as a chloride, to become more hydrophilic. Answer: A Problem 3: Which of the following is not a primary tissue? A) epithelium B) connective tissue C) nervous tissue D) muscle tissue E) osseous tissue F) All are primary tissues Answer: E Problem 4: All cells in the body can use as a source of energy A) sucrose. B) starch. C) protein. D) vitamins. E) glucose. F) All of the above Answer: E Problem 5: Which of the following is NOT a molecule synthesized in the smooth endoplasmic reticulum (SER)? A) fatty acids B) steroids C) proteins D) lipids E) All of the above are synthesized in the SER. Answer: C
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2 Problem 6: Identify the correct examples of feedback loops. A) Insulin acts in a positive feedback, because it acts to keep glucose levels constant. B) Parathyroid hormone acts in a negative feedback, because it is released when blood calcium levels are too low. C) The hypothalamic anterior pituitary pathway (HAP), because it contains three negative feedbacks. D) Oxytocin, released by the posterior pituitary gland, acts in a positive feedback because it amplifies uterine contractions and breast milk production. E) All of the above, except A. F) All of the above, except B. G) All of the above, except D. Answer: E Problem 7: Red blood cells with an internal osmolarity of 300 mOsM are placed in a solution of 400 mOsM urea, a molecule that can cross the cell membrane. The solution is A. Hyposmotic and hypotonic. B. Hyperosmotic and hypotonic.
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Exam_1_2007solution - Exam 1 BME 365R October 3 2007...

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