how substances can cross a cell surface membrane

·      (Simple / facilitated) diffusion from high to low concentration / down concentration gradient;

·       Small / non-polar / lipid-soluble molecules pass via phospholipids / bilayer; OR Large / polar / water-soluble molecules go through proteins;

·      3 Water moves by osmosis / from high water potential to low water potential / from less to more negative water potential;

·      4 Active transport is movement from low to high concentration / against concentration gradient;

·      5 Active transport / facilitated diffusion involves proteins/ carriers;

·      6 Active transport requires energy / ATP;