NAU BIO 344 Posner Final Exam Practice Questions and Answers
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Course
North Arizona University Tests 2024
Institution
North Arizona University Tests 2024
NAU BIO 344 Posner Final Exam Practice
Questions and 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: - ANSWER-tight...
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? - 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: -
ANSWER✔✔-Lateral diffusion
The forces that hold together the lipids in the membranes that surround organelles are: - 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? - ANSWER✔✔-a predominance of long chain saturated fatty acids
The reason that an action potentials cannot move backward is: - ANSWER✔✔-voltage gated sodium ion
channels cannot go directly from the inactive state to open
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