PNB 2250 Exam 3 Review - UConn
The loss of digestive wastes, CO2 and NH4+ are examples of _______________. - correct answer
✔✔excretion
The regulation of H2O and solutes is via ___________________. - correct answer ✔✔osmoregulation
Water moves from an area of ________ (low, high) osmolarity to an area of __________ (low, high)
osmolarity - correct answer ✔✔low, high
___________: a chemical dissolved in a solvent (H2O is the only solvent we are interested in) [6.02].
___________s occupy space within H2O - correct answer ✔✔solute
Osmolarity : measure of the number of ____________ per _________ of H2O, expressed as
osmoles/liter (OsM/L) or milliosmoles/liter (mOsM/L). - correct answer ✔✔solutes, liter
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. - correct answer ✔✔greater
Hypotonic (hypoosmotic): again a comparison of the the osmolarity of two solutions, with one solution
have ___________ solutes (and more H2O) than the other solution. - correct answer ✔✔fewer
Isotonic (isoosmotic): two solutions with the _________ osmolarity and H2O content. - correct answer
✔✔same
Which solution has the highest osmolarity?
A) 1M/L sucrose
B) 1M/L NaCl
C) 0.1M/L CaCl2
, D) 1M/L ZnCl2 - correct answer ✔✔D
The movement of water across the cell membrane can ___________ cells - correct answer ✔✔destroy
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 ________________ ________________. - correct
answer ✔✔osmotic pressure
Placement of cells into which solution will cause them to burst?
A) Isotonic
B) Hypotonic
C) Hypertonic - correct answer ✔✔B
Placement of cells in a ______________ solution (more H2O outside than inside the cell) causes H2O to
rush into the cell, bursting it - correct answer ✔✔hypotonic
Placement of cells in a _______________ solution (less H2O outside than inside the cell) causes H2O to
leave the cell - correct answer ✔✔hypertonic
Small solutes need integral ______________ to pass through the membrane - correct answer
✔✔proteins
Solutes or water can cross a cell membrane via ___________, _______________, or ______________ -
correct answer ✔✔pumps, transporters, channels
Membrane solute permeability can require ______ - correct answer ✔✔ATP
________ have a solute-binding pocket exposed to the extracellular or intracellular aqueous
environment. After solute binding, the energy inside _____ is used to drive a reversible conformational
The loss of digestive wastes, CO2 and NH4+ are examples of _______________. - correct answer
✔✔excretion
The regulation of H2O and solutes is via ___________________. - correct answer ✔✔osmoregulation
Water moves from an area of ________ (low, high) osmolarity to an area of __________ (low, high)
osmolarity - correct answer ✔✔low, high
___________: a chemical dissolved in a solvent (H2O is the only solvent we are interested in) [6.02].
___________s occupy space within H2O - correct answer ✔✔solute
Osmolarity : measure of the number of ____________ per _________ of H2O, expressed as
osmoles/liter (OsM/L) or milliosmoles/liter (mOsM/L). - correct answer ✔✔solutes, liter
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. - correct answer ✔✔greater
Hypotonic (hypoosmotic): again a comparison of the the osmolarity of two solutions, with one solution
have ___________ solutes (and more H2O) than the other solution. - correct answer ✔✔fewer
Isotonic (isoosmotic): two solutions with the _________ osmolarity and H2O content. - correct answer
✔✔same
Which solution has the highest osmolarity?
A) 1M/L sucrose
B) 1M/L NaCl
C) 0.1M/L CaCl2
, D) 1M/L ZnCl2 - correct answer ✔✔D
The movement of water across the cell membrane can ___________ cells - correct answer ✔✔destroy
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 ________________ ________________. - correct
answer ✔✔osmotic pressure
Placement of cells into which solution will cause them to burst?
A) Isotonic
B) Hypotonic
C) Hypertonic - correct answer ✔✔B
Placement of cells in a ______________ solution (more H2O outside than inside the cell) causes H2O to
rush into the cell, bursting it - correct answer ✔✔hypotonic
Placement of cells in a _______________ solution (less H2O outside than inside the cell) causes H2O to
leave the cell - correct answer ✔✔hypertonic
Small solutes need integral ______________ to pass through the membrane - correct answer
✔✔proteins
Solutes or water can cross a cell membrane via ___________, _______________, or ______________ -
correct answer ✔✔pumps, transporters, channels
Membrane solute permeability can require ______ - correct answer ✔✔ATP
________ have a solute-binding pocket exposed to the extracellular or intracellular aqueous
environment. After solute binding, the energy inside _____ is used to drive a reversible conformational
