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SUMMARY of what needs to be known PASSIVE TRANSPORT across a membrane is dependent upon: a diffusion gradient of molecules either side of the membrane the kinetic energy of the molecules ACTIVE TRANSPORT requires energy (ATP) from metabolism in the cell because: molecules usually move against their concentration gradient carrier proteins are often involved the… IB Biology SL 1-2. For a daily agenda and homework due dates, please go to: Raczek Blog Check the Homework blog for my videos! Brief Description: This class will include a study of cells, biochemistry, human physiology, genetics and ecology. Biology Questions and Answers Form 1 . KCSE Revision Questions and Answers. K.C.S.E Online Revision . Biology Notes Form 1 - Biology Form 1 Notes - Form 1 Biology Notes. Introduction to Biology. Biology is a branch of science that deals with the study of living things. <br>Process by which a cell divides into two new daughter cells. 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