5 Written questions
5 Matching questions
- Cell Membrane Function: 6 materials a membrane prevents from entering the cell
- Protein position within a membrane:
- Bulk Transport
- Three Types of Passive Transport
- Transport Across Cell Membranes: Selective Transport
- a the use of vesicles to facilitate movement of substances that are too large to enter or exit the cell via transport proteins
- b ...
- c - 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
- d Peripheral proteins are partially embedded in the inside or outside surface of the membrane
- e the movement of only certain substances across the cell membrane
5 Multiple choice questions
- have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.
- medication can be placed in a flat transdermal patch that sticks to the skin. A semi-permeable membrane lining the inner surface allows drugs to diffuse out of the patch at a slow, constant rate.
- Vesicle transports contents
Vacuole stores the ingested material
- a) phagocytosis - when cells "eat" by taking in large particles or other cells
b) pinocytosis - when cells "drink" by taking in droplets of fluid
- movement across cell membranes without an input of energy
2 reasons molecules move.
1. Brownian Motion
2. Concentration gradients
5 True/False questions
Hypotonic solution, → has a lower concentration of solute compared to inside the cell
Two types of transport proteins → have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.
Cell Membrane Function: A Biological Barrier → 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)
Membranes at Work 2. Kidney Dialysis → have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.
Plasmolysis → the cell membrane forms a pocket around the material to be transported, then either pinches off as a vesicle or a vacuole.