Chapter_44 - Biology, 7e (Campbell) Chapter 44:...

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Biology, 7e (Campbell) Chapter 44: Osmoregulation and Excretion 1) A marine 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 ionic content presented by the 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. 2) The body fluids of an osmoconformer would be ________ with its ________ environment. A) hypertonic; freshwater B) isotonic; freshwater C) hyperosmotic; saltwater D) isoosmotic; saltwater E) hypoosmotic; saltwater 3) Which feature of osmoregulation is found in both marine and freshwater bony fish? A) loss of water through the gills B) gain of salt through the gills C) loss of water in the urine D) no drinking of water E) gain of water through food 4) In addition to their role in gas exchange, fish gills are also directly involved in A) digestion. B) sodium osmoregulation. C) thermoregulation. D) the excretion of uric acid. E) the release of atrial natriuretic proteins. 5) All of the following represent adaptations by terrestrial animals to drying conditions except A) anhydrobiosis. B) salt glands. C) efficient kidneys. D) impervious surfaces. E) increased thirst. 6) Where and from what compound(s) is urea produced? A) liver from NH 3 (ammonia) B) liver from glycogen C) kidneys from glucose D) kidneys from glycerol and fatty acids E) bladder from uric acid and H 2 O 7) Which of the following is true of urea? It is A) insoluble in water. B) more toxic to human cells than ammonia.
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This note was uploaded on 02/27/2009 for the course SC 424111 taught by Professor Various during the Winter '08 term at Kasetsart University.

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Chapter_44 - Biology, 7e (Campbell) Chapter 44:...

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