PNB 2250 EXAM 2 Questions And Answers With Latest Updates
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Course
PNB 2250
Institution
PNB 2250
PNB 2250 EXAM 2 Questions And Answers With Latest Updates
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 elevate...
PNB 2250 EXAM 2 Questions And Answers With
Latest Updates
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
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
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.
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