What is an IB education? The IB programme continuum of international education This document is provisional pending review of the IB learner profile. Additional resources to support and communicate What is an IB Education? will be available in 2013â14.
Hello Ariana! Molecular weight and diffusion are inversely proportional; the greater the molecular weight, the slower the rate of diffusion. In fact, certain molecules can never pass through membranes, thus protecting the cell. I am not sure I understand your theory and second question.
Tutorial to help answer the question. A. Simple diffusion does not require energy: facilitated diffusion requires a source of ATP. B. Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient. C. Simple diffusion is not saturable; facilitated diffusion rates are limited by the number of functional membrane proteins and can be saturated*.