5 Written questions
5 Matching questions
- Cell Membrane Function: 6 materials a membrane prevents from entering the cell
- Hypertonic solution
- Membranes at Work 2. Kidney Dialysis
- Phospholipid bilayer
- Protein position within a membrane:
- a has a higher concentration of solute compared to the inside of the cell
- b - 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
- c Integral proteins extend through the entire bilayer and project from both surfaces
- d filters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions
- e each phospholipid molecule has a head that is hydrophilic (water-loving) and two tails that are hydrophobic (water-fearing)
5 Multiple choice questions
- 1. transport raw materials into the cell (and out of)
2. transport manufactured products and wastes out of the cell
3. prevent unwanted matter from entering the cell
4. prevent the escape of matter needed to perform cellular functions
- the movement of molecules and ions against the concentration gradient which requires ATP energy and carrier proteins to pump these molecules from an area of low solute concentration to an area of high solute concentration.
- 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
- have 3-D shapes that make them highly selective, recognizing atoms or molecules by shape, size or charge.
- the movement of only certain substances across the cell membrane
5 True/False questions
Bulk Transport → the use of vesicles to facilitate movement of substances that are too large to enter or exit the cell via transport proteins
Two types of transport proteins → a) carrier proteins - facilitate the diffusion of glucose across the cell membrane
b) channel proteins - have tunnel-like pores filled with water that allow charged ions in and out of the cell
ENDOCYTOSIS → 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.
Membranes at Work 3. Controlled Delivery of Medications → 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.
Hypotonic solution, → has a lower concentration of solute compared to inside the cell