Bio 1100 Exam 2 Practice Questions and Correct Answers
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Course
ECU BIO 1100
Institution
ECU BIO 1100
Separates the plasma membrane blank the living cell from its nonliving surroundings
Selective barrier cell membrane acts as a blank blank
Selective permeability A property of a plasma membrane that allows some substances to cross more easily than others// Regulates the entrance and exit of molecu...
Bio 1100 Exam 2 Practice Questions and
Correct Answers
Separates ✅the plasma membrane blank the living cell from its nonliving surroundings
Selective barrier ✅cell membrane acts as a blank blank
Selective permeability ✅A property of a plasma membrane that allows some
substances to cross more easily than others//
Regulates the entrance and exit of molecules into the cell
Ampipathic molecule ✅a molecule with both hydrophobic and hydrophilic ends
Stiffens and strengthens ✅cholesterol blank and blank a membrane
Fluid mosaic model ✅model that describes the arrangement and movement of the
molecules that make up a cell membrane
Weak ✅membranes are held together mainly blank hydrophobic interactions
Fluid to solid ✅as temperatures cool, membranes switch from a blank state to a blank
state
Restrains ✅at warm temperatures, cholesterol blank movement of phospholipids
Glycolipids ✅carbohydrates covalently bonded to lipids
Glycoproteins ✅Membrane carbohydrates that are covalently bonded to proteins.
- transport of specific solutes
- enzymatic activity
- signal transduction
- cell-cell recognition
- intercellular joining
- attachment to the cytoskeleton and extracellular matrix ✅cell surface membranes
carry out several functions:
Peripheral proteins ✅bound to the surface of the membrane
Integral proteins ✅penetrate the hydrophobic interior of the lipid bilayer
Transmembrane proteins ✅Integral proteins that span the membrane
, Carrier proteins ✅a protein that transports substances across a cell membrane
Cell recognition proteins ✅Glycoproteins in the plasma membrane that identify self and
help the body defend itself against pathogens.
Receptor proteins ✅Proteins that transmit information in and out of cells. They allow
communication between cells.
Channel protein ✅a protein that allows the transport of specific substances across a
cell membrane
Enzymatic proteins ✅carry out metabolic reactions directly//
Catalyzes a specific reaction
Aquaporins ✅A transport protein in the plasma membrane of a plant or animal cell that
specifically facilitates the diffusion of water across the membrane
Concentration gradient ✅difference between high and low concentrations
Diffusion ✅Movement of molecules from an area of higher concentration to an area of
lower concentration
*PASSIVE TRANSPORT
Osmosis ✅diffusion of water across a selectively permeable membrane or from high to
low
*PASSIVE TRANSPORT
Osmotic pressure ✅the external pressure that must be applied to stop osmosis
Water potential ✅the potential energy of a volume of water, expressed as a pressure
Tonicity ✅the ability of a surrounding solution to cause a cell to gain or lose water
Isotonic ✅when the concentration of two solutions is the same
Hypotonic solution ✅A solution in which the concentration of solutes is less than that of
the cell that resides in the solution
Hypertonic solution ✅A solution in which the concentration of solutes is greater than
that of the cell that resides in the solution
Osmoregulation ✅regulation of solute concentrations and water balance by a cell or
organism
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