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Exam (elaborations)

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...

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  • September 23, 2024
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  • Exam (elaborations)
  • Questions & answers
  • ECU BIO 1100
  • ECU BIO 1100
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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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