PNB 2250 Exam 3 Uconn Latest Update with complete solution
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PNB 2250 Uconn
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PNB 2250 Uconn
_______________ have a single or multiple solute binding pockets and after solute binding, a reversible
conformation movement exposes the solute-binding pocket to the other face of the membrane. -
transporters
Because of the factors affecting diffusion, H2O will move from an area of higher conce...
PNB 2250 Exam 3 Uconn
_______________ have a single or multiple solute binding pockets and after solute binding, a reversible
conformation movement exposes the solute-binding pocket to the other face of the membrane. -
transporters
Because of the factors affecting diffusion, H2O will move from an area of higher concentration (low
osmolarity) to an area of lower concentration (higher osmolarity) if the cell membrane is permeable to
H2O [6.03]. The movement of H2O in this way is a very powerful force, capable of rupturing membranes
and causing damage to animals. This force is known as ________________ ________________. -
osmotic pressure
The loss of digestive wastes, CO2 and NH4+ are examples of _______________. - excretion
Hypertonic (hyperosmotic): a comparison of the osmolarity of two solutions, with one solution have a
___________ number of solutes (and less H2O) than the other solution. - greater
The regulation of H2O and solutes is via ___________________. - osmoregulation
Water moves from an area of ________ (low, high) osmolarity to an area of __________ (low, high)
osmolarity - low, high
___________: a chemical dissolved in a solvent (H2O is the only solvent we are interested in) [6.02].
___________s occupy space within H2O - solute
Osmolarity : measure of the number of ____________ per _________ of H2O, expressed as
osmoles/liter (OsM/L) or milliosmoles/liter (mOsM/L). - solutes, liter
Hypotonic (hypoosmotic): again a comparison of the the osmolarity of two solutions, with one solution
have ___________ solutes (and more H2O) than the other solution. - fewer
, Isotonic (isoosmotic): two solutions with the _________ osmolarity and H2O content. - same
Which solution has the highest osmolarity?
A) 1M/L sucrose
B) 1M/L NaCl
C) 0.1M/L CaCl2
D) 1M/L ZnCl2 - D
The movement of water across the cell membrane can ___________ cells - destroy
Placement of cells into which solution will cause them to burst?
A) Isotonic
B) Hypotonic
C) Hypertonic - B
Placement of cells in a ______________ solution (more H2O outside than inside the cell) causes H2O to
rush into the cell, bursting it - hypotonic
Placement of cells in a _______________ solution (less H2O outside than inside the cell) causes H2O to
leave the cell - hypertonic
Small solutes need integral ______________ to pass through the membrane - proteins
Solutes or water can cross a cell membrane via ___________, _______________, or ______________ -
pumps, transporters, channels
Membrane solute permeability can require ______ - ATP
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