BIOLOGY 1201 EXAM 2 FINAL PAPER
QUESTIONS AND SOLUTIONS
◉ phospholipid bilayer
Answer: structure of cell membrane
◉ integral proteins
Answer: proteins that penetrate the hydrophobic interior of the
lipid bilayer but do not go all the way through
◉ transmembrane proteins
Answer: proteins that go through the cell membrane
◉ selective permeability
Answer: property of biological membranes that allows some
substances to cross more easily than others
◉ fluid mosaic model
Answer: model of the cell membrane that refers to phospholipids
as freely moving laterally in the membrane, but rarely flipping
from one side of the bilayer to the other side
◉ cholestrol
Answer: reduces membrane fluidity
,◉ N-terminus
Answer: amino end of transmembrane helix that sticks out on
extracellular side
◉ C-terminus
Answer: carboxyl end of transmembrane helix that sticks out of
cytoplasmic side
◉ alpha helix
Answer: coiled region constituting one form of the secondary
structure of proteins, arising from a specific pattern of hydrogen
bonding between atoms of the polypeptide backbone (not the side
chains)
◉ diffusion
Answer: transport that requires no energy (passive) and no
proteins, net movement of solute molecules down the gradient
(rate depending on concentration) until concentration reaches
equilibrium
◉ facilitated diffusion
Answer: passive transport of solutes across cell membrane down
concentration gradient with the aid of carrier proteins
◉ active transport
, Answer: Energy-requiring process that moves solutes across a cell
membrane against a concentration difference using a transport
protein
◉ Equilibrium
Answer: balance of solutes in a solution
◉ Osmosis
Answer: diffusion of water across a selectively permeable
membrane, water is moving
◉ hypotonic
Answer: relatively lower solute concentration, high water content
◉ hypertonic
Answer: relatively higher solute concentration, low water content
◉ isotonic
Answer: same solute concentrations on both sides of membrane,
indicates health in regards to animals and plants
◉ hypo to hyper
Answer: osmosis moves water from ____ solutions to ____ solutions
QUESTIONS AND SOLUTIONS
◉ phospholipid bilayer
Answer: structure of cell membrane
◉ integral proteins
Answer: proteins that penetrate the hydrophobic interior of the
lipid bilayer but do not go all the way through
◉ transmembrane proteins
Answer: proteins that go through the cell membrane
◉ selective permeability
Answer: property of biological membranes that allows some
substances to cross more easily than others
◉ fluid mosaic model
Answer: model of the cell membrane that refers to phospholipids
as freely moving laterally in the membrane, but rarely flipping
from one side of the bilayer to the other side
◉ cholestrol
Answer: reduces membrane fluidity
,◉ N-terminus
Answer: amino end of transmembrane helix that sticks out on
extracellular side
◉ C-terminus
Answer: carboxyl end of transmembrane helix that sticks out of
cytoplasmic side
◉ alpha helix
Answer: coiled region constituting one form of the secondary
structure of proteins, arising from a specific pattern of hydrogen
bonding between atoms of the polypeptide backbone (not the side
chains)
◉ diffusion
Answer: transport that requires no energy (passive) and no
proteins, net movement of solute molecules down the gradient
(rate depending on concentration) until concentration reaches
equilibrium
◉ facilitated diffusion
Answer: passive transport of solutes across cell membrane down
concentration gradient with the aid of carrier proteins
◉ active transport
, Answer: Energy-requiring process that moves solutes across a cell
membrane against a concentration difference using a transport
protein
◉ Equilibrium
Answer: balance of solutes in a solution
◉ Osmosis
Answer: diffusion of water across a selectively permeable
membrane, water is moving
◉ hypotonic
Answer: relatively lower solute concentration, high water content
◉ hypertonic
Answer: relatively higher solute concentration, low water content
◉ isotonic
Answer: same solute concentrations on both sides of membrane,
indicates health in regards to animals and plants
◉ hypo to hyper
Answer: osmosis moves water from ____ solutions to ____ solutions
