LIFE 120 CH 5 questions with correct
answers rated A+
amphipathic - correct answer ✔✔ molecule that has both a hydrophilic region and a
hydrophobic region ex: a phospholipid
fluid mosaic model - correct answer ✔✔ model of a cell membrane which envisions the
membrane as a mosaic of protein molecules drifting laterally in a fluid bilayer of phospholipids
integral proteins - correct answer ✔✔ proteins with hydrophobic regions that extend into and
often completely span the hydrophobic interior of the membrane and with the hydrophilic
regions in contact with the aqueous solution on one or both sides of the membrane
peripheral proteins - correct answer ✔✔ not embedded in the lipid bilayer at all; loosely bound
to the surface of the membrane, often exposed parts of integral proteins
glycolipids - correct answer ✔✔ a lipid with one or more covalently attached carbohydrates
Glycoproteins - correct answer ✔✔ A protein with one or more covalently attached
carbohydrates.
transport proteins - correct answer ✔✔ A transmembrane protein that helps a certain
substance or class of closely related substances to cross the membrane.
Aquaporins - correct answer ✔✔ channel protein in the plasma membrane of a plant, animal,
or microorganism cell that specifically facilitates osmosis
, diffusion - correct answer ✔✔ random thermal motion of particles, the presence of a
concentration or electrochemical gradient diffusion results in the net movement of a substance
from a region of more concentration to less concentration
concentration gradient - correct answer ✔✔ region along which the density of a substance
increases or decreases -----> represents potential energy
passive transport - correct answer ✔✔ the movement of substances across a cell membrane
without the use of energy by the cell
osmosis - correct answer ✔✔ Diffusion of water through a selectively permeable membrane
Tonicity - correct answer ✔✔ the ability of a surrounding solution to cause a cell to gain or lose
water
isotonic - correct answer ✔✔ causes no net movement of water into or out of the cell
hypertonic - correct answer ✔✔ A solution that, when surrounding a cell, will cause the cell to
lose water.
hypotonic - correct answer ✔✔ a solution that, when surrounding a cell, will cause the cell to
take up water
Osmoregulation - correct answer ✔✔ regulation of solute concentrations and water balance by
a cell or organism
turgid - correct answer ✔✔ swollen as from a fluid; bloated in plant cells
flaccid - correct answer ✔✔ limp cell walls in plants
answers rated A+
amphipathic - correct answer ✔✔ molecule that has both a hydrophilic region and a
hydrophobic region ex: a phospholipid
fluid mosaic model - correct answer ✔✔ model of a cell membrane which envisions the
membrane as a mosaic of protein molecules drifting laterally in a fluid bilayer of phospholipids
integral proteins - correct answer ✔✔ proteins with hydrophobic regions that extend into and
often completely span the hydrophobic interior of the membrane and with the hydrophilic
regions in contact with the aqueous solution on one or both sides of the membrane
peripheral proteins - correct answer ✔✔ not embedded in the lipid bilayer at all; loosely bound
to the surface of the membrane, often exposed parts of integral proteins
glycolipids - correct answer ✔✔ a lipid with one or more covalently attached carbohydrates
Glycoproteins - correct answer ✔✔ A protein with one or more covalently attached
carbohydrates.
transport proteins - correct answer ✔✔ A transmembrane protein that helps a certain
substance or class of closely related substances to cross the membrane.
Aquaporins - correct answer ✔✔ channel protein in the plasma membrane of a plant, animal,
or microorganism cell that specifically facilitates osmosis
, diffusion - correct answer ✔✔ random thermal motion of particles, the presence of a
concentration or electrochemical gradient diffusion results in the net movement of a substance
from a region of more concentration to less concentration
concentration gradient - correct answer ✔✔ region along which the density of a substance
increases or decreases -----> represents potential energy
passive transport - correct answer ✔✔ the movement of substances across a cell membrane
without the use of energy by the cell
osmosis - correct answer ✔✔ Diffusion of water through a selectively permeable membrane
Tonicity - correct answer ✔✔ the ability of a surrounding solution to cause a cell to gain or lose
water
isotonic - correct answer ✔✔ causes no net movement of water into or out of the cell
hypertonic - correct answer ✔✔ A solution that, when surrounding a cell, will cause the cell to
lose water.
hypotonic - correct answer ✔✔ a solution that, when surrounding a cell, will cause the cell to
take up water
Osmoregulation - correct answer ✔✔ regulation of solute concentrations and water balance by
a cell or organism
turgid - correct answer ✔✔ swollen as from a fluid; bloated in plant cells
flaccid - correct answer ✔✔ limp cell walls in plants
