Exam (elaborations)
Bio 344 NAU All Exams Questions answers latest update
- Course
- Bio 344
- Institution
- University Of Texas - Austin
Bio 344 NAU All Exams Questions answers latest update
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Bio 344 NAU All ExamsWhy can a sodium ion not pass through a potassium leak channel? - The sodium
ion cannot interact correctly with the oxygen atoms of the selectivity filter of the
potassium leak channel.
What is a difference between active transport and passive transport? - Passive
transport goes from high concentration to low concentration while active
transport goes from low concentration to high concentration
What is a property of the membrane spanning region of a membrane protein? - It
contains amino acids with non-polar side chains.
In order to maintain osmotic balance and maintain cell volume, what would the
Na+/K+ pump do if the cell is exposed to pure water? - Start pumping faster
because 3 ions are pumped out for two that come in and the cell needs to get rid
of as many ions as possible.
How many Na+ ions does the Na+/K+ pump transport during each cycle? - 3
What kind of ATP driven pump is the Na+/K+ pump? - P-type pump
What Molecule is Polar - H2O
, What process below will be facilitated by active transport? - Movement of glucose
into an intestinal epithelial cell.
What happens to the membrane potential when a potassium leak channel opens
up during an action potential? - The membrane potential will be restored with a
negative charge on the cytosolic layer of the membrane.
What energy source is used to transport glucose from inside an intestinal
epithelial cell to the outside? - glucose is exported passively from intestinal
epithelial cells and therefore no energy source is required.
Where are the glycolipids in an animal cell? - On the extracellular side of plasma
membranes
What is the anion transporter in red blood cells used for? - It removes CO2 from
the body in the form of HCO3-.
What would a large positive peak on a hydropathy plot signify? - That the protein
is likely to have a membrane spanning region
What does the influx of Ca2+ into an axon terminal cause? - It causes synaptic
vesicles to fuse with the membrane.
Most membrane proteins in a human red blood cell are... - Associated with the
cytoskeleton
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