©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
Page 3/17
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
Page 1/17
, ©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
Page 2/17
, ©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
Page 3/17
