Cells adhere to each other and to extracellular material by means of membrane proteins called __________ molecules (sometimes abbreviated as CAM's).  I have tirde the answer cell adhesion but it said it's worng.

Cell-cell recognition occurs because _____ is secreted from the cell and is attached to the external phospholipids

Item17       Item 17 Which is a passive transport process? Multiple Choice   Phagocytosis   Pinocytosis   Receptor-mediated endocytosis   Osmosis   Ion pump Item18       Item 18 The type of vesicular transport by which large molecules or large amounts of substances are secreted from a cell is _________. Fill in the blank Fill in the blank   Item19       Item 19 Materials tend to move less rapidly when their concentrations are significantly different between two compartments. Group startsTrue or False   Item19       Item20       Item 20   As potassium diffuses down its concentration gradient, it moves out of the cell. However, this movement is resisted by the accumulating negative charge outside the cell.   Group startsTrue or False

Simple diffusion is __________     active     passive     a form of active transport     dependent on ATP