Pnb 2250 - Study guides, Class notes & Summaries
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PNB 2250 EXAM 1 QUESTIONS AND ANSWERS ALREADY PASSED
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PNB 2250 EXAM 1 QUESTIONS AND 
ANSWERS ALREADY PASSED 
 
Which statement is true? 
a. Heme is commonly found within seawater 
b. Heme-based proteins played a key role in the metabolism of carbon dioxide into forms less 
toxic to cells. 
c. Heme-based proteins likely developed as a means by which Fe was transported safely. 
d. Oxygen binding to heme is insensitive to the presence of acid in mammals. 
e. Early anaerobic life used heme-based proteins to minimize oxygen toxicity. (e) Early 
anaerobi...
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PNB 2250 Exam 3 Questions And Answers Latest Updates
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Name an animal that has neither a circulatory system nor a respiratory system and relies solely on 
cutaneous diffusion for gas exchange. How is this adequate for its survival? - Small and thin 
animals, like flatworms and horsehair worm parasites, have no respiratory or circulatory systems and 
solely rely on cutaneous/cuticle diffusion through water or air. 
Examples of respiratory structures of aquatic animals - bulk flow (sponges, cnidarians), gills, water 
vascular system, arborescent respi...
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PNB 2250 EXAM 1 Questions with 100% Correct Answers | Latest Version 2024 | Expert Verified | Ace the Test
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Which statement is true? 
a. Heme is commonly found within seawater 
b. Heme-based proteins played a key role in the metabolism of carbon dioxide into forms 
less toxic to cells. 
c. Heme-based proteins likely developed as a means by which Fe was transported safely. 
d. Oxygen binding to heme is insensitive to the presence of acid in mammals. 
e. Early anaerobic life used heme-based proteins to minimize oxygen toxicity. (e) 
Early anaerobic life used heme-based proteins to minimize oxygen toxici...
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PNB 2250 EXAM 1 QUESTIONS WITH PASSED ANSWERS!!
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Respiratory proteins ...(E1) 
a. increase the carbon dioxide carrying capacity of water up to 50-fold. 
b. have a fixed affinity for oxygen 
c. depend on carbonic anhydrase to transport oxygen 
d. must contain iron. 
e. are not accurately described by any of the above statements - (e) are not accurately described 
by any of the above statements 
What is an advantage of a closed circulatory system? (E1) 
a. Blood can flow in any direction within a blood vessel. 
b. It requires less blood volume t...
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PNB 2250 EXAM 1 QUESTIONS WITH 100% PERFECT ANSWERS BASED ON LECTURES 1-7
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PNB 2250 EXAM 1 QUESTIONS WITH 100% PERFECT ANSWERS BASED ON LECTURES 1-7
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PNB 2250 Exam 1 (final exam prep) With Questions And Answers Graded A+
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control system components of homeostasis - (1) sensor (protein based) 
(2) controller 
(3) effector (changes physiological variable) 
physical factors of animals - (1) energy input (cost/benefit ratio) 
(2) waste removal 
(3) growth and development 
(4) impacts of physics, chemistry, geometry on body form 
convergent evolution - organisms independently evolve similar traits as a result of having to adapt 
to similar environments 
limited solutions to the same problem 
analogous structures - flig...
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PNB 2250 Exam 1 Questions And Answers Rated A+
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what animals must do? - - Mechanism for excreting waste 
- Mechanism for development and growth 
- Energy input 
Disadvantage of multicellularity - Need special cell/cell connections 
Need for cell/cell communication 
Need system for distribution of nutrients 
What traits to animals share? - Eukaryotic, heterotrophic, able to move 
Why is the fossil record incomplete? - Needs to die near water, fossilization process needs to be in 
a situation where there's no oxygen present, rapidly covered in...
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PNB 2250 Exam 1 Questions and Correct Answers | Latest Update
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What traits to animals share? 
 -:- Eukaryotic, heterotrophic, able to move 
Cell to cell connections in plants 
 -:- Plasmodesmo, flow of nutrients between cells 
Cell to cell connections animals 
 -:- Tight junctions, strong connection 
Some multicellularity advantages 
 -:- Cells have dedicated tasks (increase efficiency) 
Not all genes expressed (saves energy) 
Cells are further away from surface, ease on homeostasis 
Disadvantage of multicellularity 
 -:- Need special cell/cell connections ...
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PNB 2250 EXAM 1 QUESTIONS WITH 100 % CORRECT ANSWERS |VERIFIED
- Exam (elaborations) • 7 pages • 2024
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three frameworks of comparative systems - -Form & function of the parts under investigation 
-Phylogenetic diversity & evolution of the system in different taxa 
-Ecophysiology 
Tech designs vs living systems - -Technological advancement is an evolutionary progression 
-Organisms are impressive, beautiful & awe-inspiring 
>Exceedingly complex in architecture & functional adaptations 
>Appropriate to speak of life forms having "design" 
Emergent properties of animal physiology - - Atoms 
...
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PNB 2250 Exam 3 Questions and Correct Answers | Latest Update
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Examples of respiratory structures of terrestrial animals 
 -:- bulk flow with tracheal system and spiracles (insects), cutaneous 
(frog) 
Examples of respiratory structures of aquatic animals 
 -:- bulk flow (sponges, cnidarians), gills, water vascular system, 
arborescent respiratory trees (sea cucumber), cutaneous (leech) 
Do all aquatic animals necessarily exchange gasses in water? 
 -:- No, some aquatic animals could exchange gasses above water using 
lungs, like aquatic mammals, or cuta...
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