BY124 Mock Exam 4 - Mock Exam#4 1 A salt water sea star was...

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Mock Exam #4 1. A salt water sea star was mistakenly placed in freshwater and it died. What is the most likely explanation for its death? a. The sea star was stressed and needed more time to adapt to new conditions. b. The sea star is hypertonic to the freshwater, and it could not osmoregulate. c. The osmoregulatory system of the sea star could not handle the change in ions present in freshwater d. The contractile vacuoles used to regulate water content ruptured in the freshwater. e. The cells of the sea star dehydrated and lost the ability to metabolize energy 2. Most of our nitrogen-containing waste products are a result of _____. a. drug use b. consumption of foods high in nitrates, such as green vegetables c. protein metabolism d. the body's attempts to maintain pH homeostasis e. metabolism of fatty foods 3. In addition to their role in gas exchange, fish gills are also directly involved in a. digestion. b. osmoregulation. c. thermoregulation. d. the excretion of uric acid. e. reproduction 4. The most effective molecule for nitrogenous waste disposal in desert animals would be _____. 5. Which of the following is a tube that carries urine from the kidneys to the urinary bladder in a mammal? 6. Which of the following substances is generally filtered from the blood by the kidneys? 7. Which one of the following, if present in a urine sample, would likely be caused by trauma? a. amino acids b. glucose c. salts d. erythrocytes e. vitamins
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8. What is the function of the ascending loop of Henle?
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