Which general type of membrane protein provides "assistance" for LARGE, CHARGED, and/or HYDROphilic Solutes to cross plasma membrane?
Transport Proteins
Process involving movement of substance (other than water) from a region of High Concentration to region of Low Concentration
Diffusion
A membrane, a Concentration Gradient, & a Transport Protein are required for _______ Diffusion.
Facilitated; No Energy is used
What's the main difference between Simple Diffusion & Facilitated Diffusion?
Facilitated = Need Protein
Simple = Does not
--The transport of substances that are unable to cross membrane by simple diffusion must be "facilitated" by proteins
True or False: Osmosis has no impact on membrane permeability
True
In order to communicate, cells produce ________ molecules that travel throughout the body of a multicellular organism & attach to _________ proteins found on or in ________ cells. The interaction of these molecules results in a __________ ____________ __________ that may turn on genes that help cell respond to message it has received.
signaling
receptor
target
signal transduction pathway
Maintaining the chemical composition of cytoplasm requires great deal of ______.