5 Written questions
5 Matching questions
- Cell Membrane Function: A Selective Filter
- Cell Membrane Function: 6 materials a membrane prevents from entering the cell
- Differentiate between a Vacuole & Vesicle.
- a - salts - atoms - viruses
- sugar - ions - bacteria
- proteins (7? this is what was in the notes)
most organelles are surrounded by membranes with the same structure as a cell membrane
- b the cell membrane forms a pocket around the material to be transported, then either pinches off as a vesicle or a vacuole.
- c Vesicle transports contents
Vacuole stores the ingested material
- d the reverse of endocytosis, whereby the membrane of vesicles or vacuoles fuses with the cell membrane and the stored contents are expelled from the cell.
- e Cell membranes are semi-permeable allowing some materials to cross, while excluding others. They can select a) by particle size
- small enough to enter membrane - O2 H2O
- too large to cross - sugar
b) particular materials to transport across (they bind to chemicals based on their size shape or charge)
5 Multiple choice questions
- receptors, like antennae, detect specific compounds or cells and bind with them, triggering endocytosis.
- Know and be able to label a phospholipid bilayer diagram
- Cell membrane molecules are in constant motion (drifting past each other) resulting in:
a) membrane flexibility
b) cell's ability to change shape
- Integral proteins extend through the entire bilayer and project from both surfaces
- Loss of water in a plant cell resulting in WILTING
5 True/False questions
Brownian Motion → has the same solute concentration on both sides of the cell membrane. Equilibrium has been reached. EQUAL FLOW of water into and out of the cell
Three Types of Passive Transport 2.Osmosis → ...
Cell Membrane Function: A Biological Barrier → a cell membrane prevents many materials from entering the cell.
Three Types of Passive Transport 3.Facilitated Diffusion → diffusion of molecules across the cell membrane by way of transport proteins.
Membranes at Work 1.Water Purification: Reverse osmosis → uses pressure to force contaminated water through a membrane with fine pores that will not allow bacteria, salts, and other dissolved molecules through, resulting in water with fewer impurities