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PNB 2250 EXAM 2 PRACTICE QUESTIONS AND ANSWERS
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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...

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  • October 24, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • pnb 2250 exam 2 practice questions and answers

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©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED

FIRST PUBLISH OCTOBER 2024




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 temperature


What is not a part of thermal adaptation? (E2) - Ans:✔✔-A fever in response to an infection


When elephant seals dive to a great depth...(E2) - Ans:✔✔-they don't breath (they DO NOT left shift)


Left-shifting your metabolic curve results in...(E2) - Ans:✔✔-Greater oxygen uptake


-large animals with slower metabolisms are left-shifted


-small animals with quicker metabolisms don't need as much O2 each time because the cells are cycling

thru quickly



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, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED

FIRST PUBLISH OCTOBER 2024




Awakening from hibernation ...(E2) - Ans:✔✔-is usually triggered by an increase in the air temperature


-brown adipose tissue generates heat for animals that can't shiver (animals who hibernate)


Uncoupling proteins...(E2) - Ans:✔✔-Unlink the H+ gradient from producing ATP = allow brown adipose

tissue to consume energy without generating ATP, ONLY generate heat


T/FDirectly measuring heat production by animals as a measure of metabolic rate assumes that all fuels

produce about the same amount of heat during consumption. (E2) - Ans:✔✔-TRUE


Why can humans free dive to 210 meters? (E2) - Ans:✔✔-They behave like elephant seals and don't

breathe.


Intracellular digestion... (E2) - Ans:✔✔--occurs in vertebrate/invertebrate cells


-doesn't occur in filter feeders like baleen whales


-does NOT deliver more energy from food than external digestion


-can NOT digest large food particles


T/F All food in all animals is ultimately oxidized. (E2) - Ans:✔✔-TRUE


T/F All animals have a daily requirement for sugars. (E2) - Ans:✔✔-FALSE


T/F Essential amino acids vary between different animal species. (E2) - Ans:✔✔-FALSE


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, ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED

FIRST PUBLISH OCTOBER 2024




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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