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NAU BIO 344 Posner Final Exam Questions and Answers 100% Pass
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NAU BIO 344 Posner Final Exam Questions and Answers 100% Pass In a polarized cell, a barrier is created by a specific type of intercellular junction that maintains the separation of membrane proteins and between the apical and the basal sides of the cell. This barrier is called a: - ANSWER-tig...

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  • November 25, 2024
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  • 2024/2025
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NAU BIO 344 Posner Final Exam
Questions and Answers 100% Pass


In a polarized cell, a barrier is created by a specific type of intercellular

junction that maintains the separation of membrane proteins and between

the apical and the basal sides of the cell. This barrier is called a: -

ANSWER✔✔-tight junction


What secondary structure found in proteins is often used to enable it to

cross a membrane? - ANSWER✔✔-alpha helices


An inhibitory acetylcholine receptor would - ANSWER✔✔-be a K+ channel


The nonpolar part of a phospholipids consists of - ANSWER✔✔-fatty acid

chains


Which of the following is true concerning passive transport and active

transport: - ANSWER✔✔-passive transport transfers molecules down an

electrochemical gradient while active transport transfers molecules against

an electrochemical gradient

Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 1/22

,An example of an amphiphilic phosphoglyceride is: - ANSWER✔✔-

phosphatidlyserine


Reactions that add a phosphate to specific sites on proteins in an ATP

dependent manner are important in cell signaling. The type of enzyme that

catalyzes this reaction is: - ANSWER✔✔-a protein kinase


In a depolarized membrane, repolarization of the neural membrane would

occur as a result of: - ANSWER✔✔-opening of K+ channels


How does an action potential travel down an axon? - ANSWER✔✔-voltage

gated Na+ channels go from closed to open to inactivated in an

orchestrated sequential manner


In the presynaptic nerve cell, opening of voltage gated Ca+2 channels at the

nerve terminal leads to: - ANSWER✔✔-exocytosis of the contents of

secretory vesicles into the synaptic cleft


The Na+-K+ pump requires ______ molecule(s) of ATP to transport ______

Na+ ions out of the cell and _______ K+ ions into the cell. - ANSWER✔✔-1,

3, 2




Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 2/22

, Phospholipase C and Phospholipase A1 differs differ - ANSWER✔✔-in the

specific site where they cleave phospholipids


Which of the following are used to transport K+ ions against their

electrochemical gradient? - ANSWER✔✔-the sodium potassium pump


Why is it that in a resting neuron with K+ leak channels open, there are

different concentrations of K+ ions on the two sides of the plasma

membrane? - ANSWER✔✔-the membrane potential of a cell is negative

and thus the equilibrium concentration of positively charged K+ ions is

higher inside than outside the cell.


Phosphatidylinositol 3-Kinase (also known as PI3K) is a lipid kinase. The 3

is letting you know that: - ANSWER✔✔-it catalyzes the addition of a

phosphate to the 3 position of the inositol ring.


A glycolipid that is part of the plasma membrane will be found: -

ANSWER✔✔-only on the side of the bilayer that faces away from the cell

(towards the extracellular fluid)


When transporting a negatively charged ion through a ligand gated ion

channel across the plasma membrane, which of the following is True? -

Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 3/22

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