science vocab

January 16, 2018 Off By admin
Question Answer
active transport the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
concentration gradient the process of particles, which are sometimes called solutes, moving through a solution or gas from an area with a higher number of particles to an area with a lower number of particles.
carrier protiens transports specific substance through intracellular compartments, into the extracellular fluid, or across the cell membrane.
diffusion the spreading of something more widely, the intermingling of substances by the natural movement of their particles, action of spreading the light from a light source evenly so as to reduce glare and harsh shadows.
hydrophobic repel or fail to mix with water.
hypotonic solution solution that has a lower osmotic pressure than another solution- concentration of solutes is greater inside the cell than outside of it
hypertonic solution the concentration of solutes is greater outside the cell than inside it
hydrophilic having a tendency to mix with, dissolve in, or be wetted by water.
ion channels a cell membrane channel that is selectively permeable to certain ions (as of calcium or sodium)
isotonic solution two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side
osmosis a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.
phospholipid bilayer a two-layered arrangement of phosphate and lipid molecules that form a cell membrane, the hydrophobic lipid ends facing inward and the hydrophilic phosphate ends facing outward.
protien class of nitrogenous organic compounds that consist of large molecules composed of one or more long chains of amino acids and are an essential part of all living organisms, especially as structural components of body tissues such as muscle, hair, collagen
passive transport movement of ions and other atomic or molecular substances across cell membranes without need of energy input