BIO 111 Quiz #6
All of the following are examples of the 6 major functions of membrane proteins EXCEPT: 1. transport, 2. signal transduction, 3. cell growth, 4. cell-cell recognition
3. cell growth
Which of the following processes includes all others?: 1. osmosis, 2. facilitated diffusion, 3. passive transport, 4. transport of an ion down its electrochemical gradient.
3. passive transport
According to the fluid mosaic model of cell membranes, phospholipids ______.
Can kove katerslly along the plane of the membrane.
T/F: glycolipids and glycoproteins in the plasma membrane function mainly for membrane stability.
False
T/F: In an isotonic solution, there is no net movement of water across the membrane.
True
What happens to water in osmosis?
Water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration.
Diffusion is __________.
a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
For a protein to be an integral membrane protein, it would have to be ________.
amphipathic, with at least one hydrophobic region.
The membranes of winter wheat are able to remain fluid when it is extremely cold by ________.
increasing the percentage of unsaturated phospholipids in the membrane.
What membrane activity requires energy from ATP?
movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid