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37 terms

Diffusion

Beck
STUDY
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the movement of molecules from a high concentration to a low concentration is called:
diffusion
diffusion of water through a semipermeable membrane is called:
osmosis
the movement of substances from lower to higher concentration across a semi permeable membrane that must have a specific protein carrier and cell expenditure of energy is called:
active transport
the movement of substances fromhigher to lower concentration across a semi permeable membrane that must have a specific protein carrier but no energy expenditure is called:
facilitated diffusion
the use of energy by the cell to enclose a substance in its membrane by froming a vacuole and engulfing it is called:
endocytosis
bacteria that live in fresh water are moved to cell water, they will
shrivel
Does endocytosis require the cell to use ATP?
yes
when whole cells or large molecules are engulfed by the cell, this endocytosis is specifically called:
phagocytosis
In what kind of conditions will the cell wall prevent the cell from bursting
hypotonic
energy expenditure is not required
substances exist in a gradient and move from areas of high to low concentration in the gradient
passive transport
examples of passive transport
diffusion and facilitated diffusion
a fundamental property of atoms and molecules that exist in a state of random motion
diffusion
molecule binds to a receptor in membrane and is carried across other side
facilitated diffusion
nonspecific Brownian movement
qualities of diffusion
molecule specific
transport both ways
qualities of facilitated diffusion
energy expenditure is required
rate of transport is increased
transport may occur against a concentration gradient
active transport
3 examples of active transport
carrier mediated active transport, group translocation and bulk transport
atoms or molecules are pumped into or out of the cell by specialized receptors.
driven by ATP or the proton motive force
carrier-mediated active transport
molecule is moved across membrane and simultaneously converted to a metabolically useful substance
group translocation
mass transport of large particles, cells, and liquids by engulfment and vesicle formation
bulk transport
transports simple sugars, amino acids, inorganic ions (Na and K)
qualities of carrier-mediated active transport
alternate system for transporting nutrients (sugars, amino acids)
qualities of group translocation
includes endocytosis, phagocytosis and pinocytosis
qualities of bulk transport
troph
food
phile
to love
obe
to live
hetero
other
auto
self
photo
light
chemo
chemical
sapro
rotton
halo
salt
thermo
heat
psychro
cold
aero
air (oxygen)
obligate or strict
being restricted to a narrow niche or habitat
facultative
means not being restricted to a narrow habitat