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difference in the concentration of a substance from one location to another
Protein that detects signals and acts because of it
movement of molecules from a high concentration to low
diffusion of water molecules
more salt added to water: higher concentration of salt, lower concentration of water.
solution that has the same concentration of solutes that the cell has
solution that has a higher concentration of solutes than a cell. water diffuses out of the cell and shrinks
solution that has a lower concentration of solutes than the cell. water diffuses into the cell and expands.
molecules diffuse through transported proteins b/c they can't diffuses through the cell membranes themselves.
uses energy to transport molecules from an area of lower concentration to an area of higher concentration
moves substances out of the cell
cells use energy to transport a materiel that is too large to cross the membrane
cell membrane grows out to surround large particles
jellylike material that contains the building block needed for life
small and have no distinct internal parts
have a nucleus and other membrane-bound organelles
a small part that carries out a specific job in a cell
gives cell shape, support, and strength
molecule used in all life function: reproduction, repair, and growth
helps production of proteins and other molecules
link amino acids to form proteins
changes, packaged, and transports cells to other parts in the cell
carry different molecules to where they are needed
produce chemical energy that can be used by cells
store materials in a cell: water, food molecules, enzymes, and ions
protects a cells by attacking incoming bacteria/viruses
help form cilia and flagella
supports, shaped, and protects the cell
converts energy from the sun into chemical energy through photosynthesis
controls what comes into and goes out of the cell
made of a phosphate group, a glycerol, and to fatty acid chains. interact w/ water
allows some material, but not all, to cross the cell membrane
high concentration to low concentration