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Terms in this set (29)
net movement of dissolved substances across a cell membrane by an energy-requiring process that moves substances against a concentration gradient from a region of lower to higher concentration.
channel proteins that are specific for the facilitated diffusion of water molecules.
trans-membrane proteins involved in the facilitated transport of hydrophilic substances across the plasma membrane in a process in which the shape of the carrier protein changes.
trans-membrane proteins involved in the transport of specific substances across a plasma membrane by facilitated diffusion.
cell organelle consisting of a system of membrane-bound channels that transport substances within the cell.
cell or organism with a membrane-bound nucleus.
movement of material out of cells via vesicles in the cytoplasm.
form of diffusion involving a specific carrier molecule for the substance that diffuses.
fluid mosaic model
a model which proposes that the plasma membrane and other intracellular membranes should be considered as two-dimensional fluids in which proteins are embedded.
combination formed when a carbohydrate group becomes attached to the exposed part of a trans-membrane protein .
organelle that packages material into vesicles for export from a cell
having a higher concentration of dissolved substances than the solution to which it is compared.
having a lower concentration of dissolved substances than the solution to which it is compared.
fundamental components of the plasma membrane that are embedded in the phospholipid bilayer.
having the same concentration of dissolved substances as the solution to which it is compared.
membrane-bound vesicles containing digestive enzymes
net movement of water molecules across a partially permeable membrane and down a concentration gradient.
bulk movement of solid material into cells.
major type of lipid found in plasma membranes and the main structural component of plasma membranes.
bulk movement of material that is in solution being transported into cells.
any cells or organisms without a membrane-bound nucleus.
macromolecules built of amino acid sub-units and linked by peptide bonds to form a chain, sometimes termed a polypeptide; usual product of gene translation; some proteins consist of a single polypeptide while other proteins consist of two or more polypeptides.
special transport proteins embedded across the plasma membrane that carry out the process of active transport.
chemical structures, often on the surface of cells, that receive signals from hormones, neurons or cytokines.
organelles containing RNA that are major sites of protein production in cells in both eukaryotes and prokaryotes.
describes the plasma membrane as selectively permeable or partially permeable in that it allows only certain molecules to cross it by diffusion.
the movement of substances across the phospholipid bilayer from a region of higher concentration to one of lower concentration of that substance; that is, down its concentration gradient.
protein that transports sodium and potassium ions against their concentration gradients to maintain the differences in their concentrations inside and outside cells.
membrane-bound sacs found within a cell, typically fluid filled; one kind of vesicle containing digestive enzymes is known as a lysosome.
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