NAU BIO 344 Posner Final Exam Questions and Answers well Explained Latest 2024/2025 Update 100% Correct.
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NAU BIO 344 Posner
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NAU BIO 344 Posner
Which of the following is true concerning passive transport and active transport: - passive
transport transfers molecules down an electrochemical gradient while active transport transfers
molecules against an electrochemical gradient
In a polarized cell, a barrier is created by a specific type o...
NAU BIO 344 Posner Final Exam
Which of the following is true concerning passive transport and active transport: - passive
transport transfers molecules down an electrochemical gradient while active transport transfers
molecules against an electrochemical gradient
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: - tight junction
What secondary structure found in proteins is often used to enable it to cross a membrane? -
alpha helices
An inhibitory acetylcholine receptor would - be a K+ channel
The nonpolar part of a phospholipids consists of - fatty acid chains
An example of an amphiphilic phosphoglyceride is: - 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: - a protein kinase
In a depolarized membrane, repolarization of the neural membrane would occur as a result of: -
opening of K+ channels
How does an action potential travel down an axon? - 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: -
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. - 1, 3, 2
Phospholipase C and Phospholipase A1 differs differ - in the specific site where they cleave
phospholipids
Which of the following are used to transport K+ ions against their electrochemical gradient? - the
sodium potassium pump
Phosphatidylinositol 3-Kinase (also known as PI3K) is a lipid kinase. The 3 is letting you know that: -
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: - 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? - the direction of transport is determined by both the
concentration gradient and the membrane potential
Both lipid and protein molecules can diffuse in the plane of a membrane. This is referred to as: -
Lateral diffusion
The forces that hold together the lipids in the membranes that surround organelles are: - Non-
Covalent interactions
A prokaryotic organism is isolated from a hydrothermal vent in Yellowstone national park where despite
the fact that the temperature is extremely high, it has been thriving. In the plasma membrane of such an
organism, which of the following concerning its phospholipid composition will help it adapt to the high
temperature of its environment? - a predominance of long chain saturated fatty acids
The reason that an action potentials cannot move backward is: - voltage gated sodium ion
channels cannot go directly from the inactive state to open
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