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Chapter 7

Vocabulary Pt.1

TermDefinition
plasma membrane boundary that separates cell from surroundings
selective permeability allows substances to cross more easily than others
amphipathic molecule contain hydrophobic and hydrophilic regions
fluid mosaic model states a membrane is a fluid structure with a mosaic of various proteins embedded
peripheral protein protein bound to membrane surface
integral protein protein that penetrate the hydrophobic core
transmembrane protein protein that spans the membrane
transport proteins allows passage of hydrophilic substances across membrane
aquaporins facilitate passage of water
ribosomes complexes made of RNA and protein and carry out protein synthesis
smooth er endoplasmic reticulum that lacks ribosomes
rough er endoplasmic reticulum studded with ribosomes
transport vesicles secretory proteins surrounded by membranes
passive transport diffusion of substance across a membrane, with no energy used
diffusion tendency for molecules to spread out evenly into available space
concentration gradient region in which the density of chemical substance increases or decreases
osmosis diffusion of water across a selectively permeable membrane
tonicity ability of a surring solution to cause a cell to gain or lose water
isotonic concentration is the same inside and outside the cell, no net water movement
hypotonic solute concentration is less than concentration inside cell, gains water
hypertonic solute concentration is greater outside cell, cell loses water
Created by: akierah.w
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