BIO1300 Exam II Latest Test Questions
and Already Passed Answers (2025)
Updated.
fluid mosaic model - Answer model that describes the arrangement and movement of the
molecules that make up a cell membrane
Glycoproteins - Answer Membrane carbohydrates that are covalently bonded to proteins.
Glycolipids - Answer Membrane carbohydrates that are covalently bonded to lipids.
role of cholesterol in membrane - Answer -disrupts the regular packing fo the hydrocarbon
tails of phospholipid molecules, so prevents them from crystallizing and behaving as a solid.
-However it also restricts molecular motion and therefore the fluidity of the membrane.
-It also reduces the permeability to hydrophilic particles such as sodium ions and hydrogen ions.
-Due to its shape it can help membranes to curve into a concave shape, which helps in the
formation of vesicles during endocytosis.
integral proteins - Answer penetrate the hydrophobic interior of the lipid bilayer
peripheral proteins - Answer The proteins of a membrane that are not embedded in the lipid
bilayer; they are appendages loosely bound to the surface of the membrane.
is it more likely for phospholipids to move laterally of flip transversely across PM? - Answer
move laterally
As temps cool, membranes switch from a ___ state to a ___ state - Answer fluid to a solid
state
the temp at which a membrane solidifies depends on - Answer types of lipids and steroid
cholesterol in PM
at moderate temps, cholesterol ________________________ membrane fluidity - Answer
, viscous - Answer saturated PM
fluid - Answer unsaturated PM
Membranes rich in unsaturated fatty acids are - Answer more fluid than those rich in saturated
fatty acids
fluid cell membrane - Answer unsaturated hydrocarbon tails
proteins - Answer determine most of the membranes specific functions
major functions of membrane proteins - Answer Transport
Enzymatic activity
Signal transduction
Cell-cell recognition
Intercellular joining
Attachment to the cytoskeleton and extracellular matrix (ECM)
what can pass through the cell membrane easiest? CO2, H2O, Sugar, Na+? - Answer CO2
diffusion and osmosis - Answer two types of passive transport
active transport - Answer Energy-requiring process that moves material across a cell
membrane against a concentration difference
diffusion - Answer Movement of molecules from an area of higher concentration to an area of
lower concentration.
osmosis - Answer Diffusion of water through a selectively permeable membrane
isotonic solution - Answer A solution in which the concentration of solutes is essentially equal
to that of the cell which resides in the solution
and Already Passed Answers (2025)
Updated.
fluid mosaic model - Answer model that describes the arrangement and movement of the
molecules that make up a cell membrane
Glycoproteins - Answer Membrane carbohydrates that are covalently bonded to proteins.
Glycolipids - Answer Membrane carbohydrates that are covalently bonded to lipids.
role of cholesterol in membrane - Answer -disrupts the regular packing fo the hydrocarbon
tails of phospholipid molecules, so prevents them from crystallizing and behaving as a solid.
-However it also restricts molecular motion and therefore the fluidity of the membrane.
-It also reduces the permeability to hydrophilic particles such as sodium ions and hydrogen ions.
-Due to its shape it can help membranes to curve into a concave shape, which helps in the
formation of vesicles during endocytosis.
integral proteins - Answer penetrate the hydrophobic interior of the lipid bilayer
peripheral proteins - Answer The proteins of a membrane that are not embedded in the lipid
bilayer; they are appendages loosely bound to the surface of the membrane.
is it more likely for phospholipids to move laterally of flip transversely across PM? - Answer
move laterally
As temps cool, membranes switch from a ___ state to a ___ state - Answer fluid to a solid
state
the temp at which a membrane solidifies depends on - Answer types of lipids and steroid
cholesterol in PM
at moderate temps, cholesterol ________________________ membrane fluidity - Answer
, viscous - Answer saturated PM
fluid - Answer unsaturated PM
Membranes rich in unsaturated fatty acids are - Answer more fluid than those rich in saturated
fatty acids
fluid cell membrane - Answer unsaturated hydrocarbon tails
proteins - Answer determine most of the membranes specific functions
major functions of membrane proteins - Answer Transport
Enzymatic activity
Signal transduction
Cell-cell recognition
Intercellular joining
Attachment to the cytoskeleton and extracellular matrix (ECM)
what can pass through the cell membrane easiest? CO2, H2O, Sugar, Na+? - Answer CO2
diffusion and osmosis - Answer two types of passive transport
active transport - Answer Energy-requiring process that moves material across a cell
membrane against a concentration difference
diffusion - Answer Movement of molecules from an area of higher concentration to an area of
lower concentration.
osmosis - Answer Diffusion of water through a selectively permeable membrane
isotonic solution - Answer A solution in which the concentration of solutes is essentially equal
to that of the cell which resides in the solution
