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consists of a cross-linked network of long filaments embedded in a stiff surrounding material
carbohydrates that have hydrophillic polysaccharides. synthesized in Rough ER and golgi apparatus
fibre composite secreted by animal cells. consists of protein fibres and is synthesized by the Rough ER and Golgi apparatus
primary cell walls of adjacent cells attach to a central layer designated in the middle lamella
gaps in cell walls where plasma membrane and cytoplasm of two cells are continuous. smooth er runs through these holes
create channels between cells. allow water, ions and small molecules to move in between cells
presene of an appropriate ___ dictates which cells will be able to resond to a particular hormone
occurs when a hormone arrives at the cell surface and transmits a message. occurs inside the cell at the plasma membrane.
activated by several second messengers. activate or inactivate other proteins by adding a P group to them
receptor tyrosine kinases
enzyme linked receptors. when a hormone binds to one of these, the protein responds by forming a dimer
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