Biology 11th Edition by Gerald Audesirk,Teresa Audesirk,Bruce Byers

تمرين 9

A membrane that is permeable to some substances but not to others is described as being ______________. The movement of a substance through a membrane down its concentration gradient is called ______________. When applied to water, this process is called ______________. Channels that are specific for water are called ______________. The process that moves substances through a membrane against their concentration gradient is called ______________.