Pnb 2250 exam - Study guides, Class notes & Summaries
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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 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 3 UCONN Questions And Answers With Real Tests
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PNB 2250 Exam 3 UCONN Questions And Answers With Real Tests 
The loss of digestive wastes, CO2 and NH4+ are examples of _______________. ANS excretion 
 
The regulation of H2O and solutes is via ___________________. ANS osmoregulation 
 
Water moves from an area of ________ (low, high) osmolarity to an area of __________ (low, high) osmolarity ANS low, high 
 
___________: a chemical dissolved in a solvent (H2O is the only solvent we are interested in) [6.02]. ___________s occupy space within...
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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 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 (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 1-4 Questions (Final Review) Questions And Answers Latest Top Score.
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PNB 2250 EXAM 1-4 Questions (Final Review) Questions And Answers Latest Top Score. 
 
 
 
 
 
Which statement is true? (E1) 
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 min...
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PNB 2250 Exam 1 Questions And Answers
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PNB 2250 Exam 1 Questions And Answers 
Plant specific cell to cell connections ANS plasmodesma 
 
animal specific cell to cell connections ANS tight junctions 
 
What systems are able to exist because of multicellularity? ANS Control systems and distribution 
 
What organisms have the highest number of genes? ANS Plants 
 
Why is the fossil record incomplete? ANS loss of soft tissue and DNA 
 
What is the extant ancestor to animals? ANS Choanoflagellate
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PNB 2250 Exam 1 Questions And Answers Rated A+
- Exam (elaborations) • 13 pages • 2024
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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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