NAU BIO 344 Posner Final Exam Questions with Correct Answers
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NAU BIO 344
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NAU BIO 344
NAU BIO 344 Posner Final Exam Questions with Correct Answers
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: - Correct Answer ...
NAU BIO 344 Posner Final Exam Questions
with Correct Answers
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: - Correct Answer tight junction
What secondary structure found in proteins is often used to enable it to cross a membrane? - Correct
Answer alpha helices
An inhibitory acetylcholine receptor would - Correct Answer be a K+ channel
The nonpolar part of a phospholipids consists of - Correct Answer fatty acid chains
Which of the following is true concerning passive transport and active transport: - Correct Answer
passive transport transfers molecules down an electrochemical gradient while active transport
transfers molecules against an electrochemical gradient
An example of an amphiphilic phosphoglyceride is: - Correct 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: - Correct Answer a
protein kinase
In a depolarized membrane, repolarization of the neural membrane would occur as a result of: -
Correct Answer opening of K+ channels
How does an action potential travel down an axon? - Correct 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:
- Correct 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. - Correct Answer 1, 3, 2
, Phospholipase C and Phospholipase A1 differs differ - Correct Answer in the specific site where they
cleave phospholipids
Which of the following are used to transport K+ ions against their electrochemical gradient? - Correct
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? - Correct 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: -
Correct 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: - Correct 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? - Correct Answer 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: -
Correct Answer Lateral diffusion
The forces that hold together the lipids in the membranes that surround organelles are: - Correct
Answer 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? - Correct Answer a predominance of long
chain saturated fatty acids
The reason that an action potentials cannot move backward is: - Correct Answer voltage gated
sodium ion channels cannot go directly from the inactive state to open
The sodium potassium pump is a - Correct Answer P-type ATPase
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