If particles are moving from HIGH to LOW concentration across a membrane, then they are moving ______ the concentration gradient.Group of answer choicesUpAgainstWithnone of these are correct

The molecule that diffuses down a concentration gradient moves from an area of ____concentration into an area of _____concentration.a.high, low                                      b.low, highc.passive, active

Both the concentration gradient and the electrical gradient affect the diffusion of __________ across membranes.Group of answer choiceswaterproteinsionslipidsATP

The movement of a substance across a cell membrane against its concentration or electrochemical gradient.Group of answer choicesdiffusionosmosisactive transportpassive transportfacilitated diffusion

Which of the following is true about diffusion?Multiple choice question.Molecules move against their concentration gradients.Molecules move down their concentration gradients.

Simple diffusion is the movement of molecules from areas of ______ concentration to areas of ______ concentration.Multiple choice question.lower; lowerhigher; lowerhigher; higherlower; higher