5 Written questions
5 Matching questions
- Particle Model of Matter
- Turgor pressure
- Protein position within a membrane:
- Three Types of Passive Transport 3.Facilitated Diffusion
- Three Types of Passive Transport: 1. Diffusion
- a diffusion of molecules across the cell membrane by way of transport proteins.
- b all matter is made of tiny particles
- c The cell wall of a plant resists the pressure of a water-filled vacuole keeping the plant firm
- d the net movement of particles from an area of high concentration to an area of low concentration
- no energy is expended
- in a cell very small particles can cross the cell membrane by moving between the phospholipid molecules
- e Peripheral proteins are partially embedded in the inside or outside surface of the membrane
5 Multiple choice questions
- Cell membrane molecules are in constant motion (drifting past each other) resulting in:
a) membrane flexibility
b) cell's ability to change shape
- the difference in concentration between two areas for any given molecule produces a gradient or path of movement in which molecules move toward areas where the concentration of particles is lower
- molecules move down a concentration gradient
- a state at which molecules are evenly distributed (the concentration is equal throughout the medium)
- molecules continue moving but equilibrium is maintained
- 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
- filters toxic wastes that accumulate in the blood while retaining necessary proteins, glucose, amino acids & ions
5 True/False questions
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.
Active Transport → the use of vesicles to facilitate movement of substances that are too large to enter or exit the cell via transport proteins
Plasmolysis → 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.
EXOCYTOSIS → the cell membrane forms a pocket around the material to be transported, then either pinches off as a vesicle or a vacuole.