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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:
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:
the use of energy by the cell to enclose a substance in its membrane by froming a vacuole and engulfing it is called:
when whole cells or large molecules are engulfed by the cell, this endocytosis is specifically called:
energy expenditure is not required
substances exist in a gradient and move from areas of high to low concentration in the gradient
energy expenditure is required
rate of transport is increased
transport may occur against a concentration gradient
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
mass transport of large particles, cells, and liquids by engulfment and vesicle formation
transports simple sugars, amino acids, inorganic ions (Na and K)
qualities of carrier-mediated active transport
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