BIOLOGY 1201 EXAM 2 QUESTIONS AND
ANSWERS 2026 VERIFIED.
Control point - ANS the cell membrane serves as a ____ for transport of water and solutes
into and out of the cell
phospholipid bilayer - ANS structure of cell membrane
integral proteins - ANS proteins that penetrate the hydrophobic interior of the lipid bilayer
but do not go all the way through
transmembrane proteins - ANS proteins that go through the cell membrane
selective permeability - ANS property of biological membranes that allows some substances
to cross more easily than others
fluid mosaic model - ANS 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 - ANS reduces membrane fluidity
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, N-terminus - ANS amino end of transmembrane helix that sticks out on extracellular side
C-terminus - ANS carboxyl end of transmembrane helix that sticks out of cytoplasmic side
alpha helix - ANS 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 - ANS 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 - ANS passive transport of solutes across cell membrane down
concentration gradient with the aid of carrier proteins
active transport - ANS Energy-requiring process that moves solutes across a cell membrane
against a concentration difference using a transport protein
Equilibrium - ANS balance of solutes in a solution
Osmosis - ANS diffusion of water across a selectively permeable membrane, water is moving
hypotonic - ANS relatively lower solute concentration, high water content
hypertonic - ANS relatively higher solute concentration, low water content
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ANSWERS 2026 VERIFIED.
Control point - ANS the cell membrane serves as a ____ for transport of water and solutes
into and out of the cell
phospholipid bilayer - ANS structure of cell membrane
integral proteins - ANS proteins that penetrate the hydrophobic interior of the lipid bilayer
but do not go all the way through
transmembrane proteins - ANS proteins that go through the cell membrane
selective permeability - ANS property of biological membranes that allows some substances
to cross more easily than others
fluid mosaic model - ANS 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 - ANS reduces membrane fluidity
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 13
, N-terminus - ANS amino end of transmembrane helix that sticks out on extracellular side
C-terminus - ANS carboxyl end of transmembrane helix that sticks out of cytoplasmic side
alpha helix - ANS 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 - ANS 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 - ANS passive transport of solutes across cell membrane down
concentration gradient with the aid of carrier proteins
active transport - ANS Energy-requiring process that moves solutes across a cell membrane
against a concentration difference using a transport protein
Equilibrium - ANS balance of solutes in a solution
Osmosis - ANS diffusion of water across a selectively permeable membrane, water is moving
hypotonic - ANS relatively lower solute concentration, high water content
hypertonic - ANS relatively higher solute concentration, low water content
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 13
