DPT 712: MOVEMENT OF MOLECULES EXAM QUESTIONS AND
ANSWERS VERIFIED BY EXPERTS GRADED A++
solute
substance that is dissolved in a liquid
solvent
substance that dissolves a solute , creating a solution
Solutes and water move from areas of ___________ concentrations to areas of
___________ concentrations. unless they are prevented from following this
gradient
high; low
diffusion
spontaneous net movement of particles down a concentration gradient ultimately
resulting in equal distribution of the particles
driven by thermal energy of the system
what biological molecules move by simple diffusion
oxygen, CO2, many nutrients, ions and small molecules
Why does compartmentalization occur?
because of epithelial layers or membranes that limit or prevent diffusion
Intracellular space =
Extracellular/interstitial space =
, M-, K+, Cl-, Na+;
K+, Cl-, Na+
Where would freely permeable membrane be found?
epithelial lining of the capillaries and alveoli, cellular membranes, membranes of
organelle, blood-brain barrier
Semi-permeable Membrane
selective membrane; allows materials to move across it.
composed of lipids and proteins, in a SPECIFIC orientation
creates and maintains unequal solute concentrations in the compartments
little holes regular the size of molecules that get through
another name for semi=permeable membrane
lipid bilayer
hydrophilic molecules
"water loving", form the external and internal layer
-interact with charged molecules (polar)
-proteins, vitamins, ions, hormones
-molecules have difficulty moving across cell membrane
Hydrophobic
ANSWERS VERIFIED BY EXPERTS GRADED A++
solute
substance that is dissolved in a liquid
solvent
substance that dissolves a solute , creating a solution
Solutes and water move from areas of ___________ concentrations to areas of
___________ concentrations. unless they are prevented from following this
gradient
high; low
diffusion
spontaneous net movement of particles down a concentration gradient ultimately
resulting in equal distribution of the particles
driven by thermal energy of the system
what biological molecules move by simple diffusion
oxygen, CO2, many nutrients, ions and small molecules
Why does compartmentalization occur?
because of epithelial layers or membranes that limit or prevent diffusion
Intracellular space =
Extracellular/interstitial space =
, M-, K+, Cl-, Na+;
K+, Cl-, Na+
Where would freely permeable membrane be found?
epithelial lining of the capillaries and alveoli, cellular membranes, membranes of
organelle, blood-brain barrier
Semi-permeable Membrane
selective membrane; allows materials to move across it.
composed of lipids and proteins, in a SPECIFIC orientation
creates and maintains unequal solute concentrations in the compartments
little holes regular the size of molecules that get through
another name for semi=permeable membrane
lipid bilayer
hydrophilic molecules
"water loving", form the external and internal layer
-interact with charged molecules (polar)
-proteins, vitamins, ions, hormones
-molecules have difficulty moving across cell membrane
Hydrophobic
