Molecules, Membranes, & Movement Lab Quiz Flashcards
What constitutes as a hydrogen bond?
Forms between polar molecules
Attraction between partially positive hydrogen atom and a partially negative atom
Individually, weak, but collectively strong
What is currently the accepted model of the plasma membrane?
Fluid mosaic model
Define osmosis
Osmosis is a type of diffusion
It’s the movement of water across the plasma membrane
Moves from an area of high concentration to an area of low concentration
Define diffusion
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached
Define passive transport
Movement of substances down to their concentration gradient across the plasma
Passive transport, requires no energy input
What is active transport?
Movement of substances, across the plasma membrane against their concentration gradient
Active transport requires energy
What is semi permeability?
Some substances move freely through the plasma, membrane, and others do not
Define tonicity
Solute concentration of the solution outside the cell compared to the solute concentration of the solution inside the cell
Define hypotonic
Lower solute concentration than the cell
Water moves into the cell
Cell swells and burst
Define isotonic
Same solute concentration as the cell
No net movement of water
No change in cell shape and size
Define hypertonic
Higher solute concentration than the cell
Water moves out of the cell
Cell shrinks
Water has - and is known as the —.
Water has great solubility and is known as the universal solvent
What is polar?
Polar is when electrons are shared unequally
What is nonpolar?
Nonpolar are shared equally electrons
What is the difference between carrier proteins and peripheral proteins?
Peripheral proteins recognize proteins, carrier, proteins, transfer proteins
