PNB 2250 EXAM 2 PRACTICE
QUESTIONS AND ANSWERS
What are examples of thermal adaptation? (adapting to change in temp) (E2) - Ans:--Expression of
alternative protein forms.
-The presence of heat exchangers in the legs of ducks
-Changes in gene transcription.
-Previous exposure to elevated tempe...
T/F Animal cells vary widely in how they extract chemical bond energy from sugars and lipids. (E2) -
Ans:✔✔-FALSE
T/F An animal's metabolic rate is easily measured by the production of carbon dioxide. (E2) - Ans:✔✔-
FALSE
Marine fish ...(E2) - Ans:✔✔-are predominantly ectotherms.
A cat...(E2) - Ans:✔✔-can survive winter temperatures that would be lethal during the summer.
A duck standing in a cold lake...(E2) - Ans:✔✔--loses heat to the water through conduction.
-can prevent heat loss through countercurrent heat exchangers.
-can have feet that are very cold.
-can coat its feathers with oil to decrease the contact of cold water with its skin.
All animals (homeothermic and heterothermic) strive to maintain their core temperature at a preferred
temperature because...(E2) - Ans:✔✔-all biochemical processes are temperature dependent.
It may be possible to freeze a small vertebrate, like a tree frog, and have it survive if ...(E2) - Ans:✔✔-
nucleating agents regulate the formation of ice crystals outside cells and the nervous system survives.
Birds have a ____ core temperature than mammals and ____(E2) - Ans:✔✔--a higher
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