Chapter 5 Biology

Frequently, transplanted organs are rejected by the receipients body. How is this reaction related to plasma membranes

Each person has a unique set of carbohydrate chains attached to his or her plasma membranes

the eukaryotic cell has multiple membrane enclosed compartment This evolutionoary innovation provides what advantage to the cell

The different membrane enclosed spaces allow different parts of the cell to perform specific functions

Utah's Great Salt Lake has an average salinity seven times higher than that of the oceans. Very few mutlticellular organisms live in this harsh environment. An example is the brine shrimp, which must devote a large portion of its metabolic energy to osmoregulation. These brine shrimp must

actively pump water back into their cells to counter its loss due to osmosis

Overall membranes seem to have a great deal in common, but on closer inspection it is revealed that membrances of different cells have unique properties. What is the primary component of membranes that gives membranes cell specific properties

protiens

When placed in a hypotonic environment where the solute concentration is below that of the cell a houseplant will

remain standing upright

osmosis is often viewed incorrectly as a process driven directly by differences in solute concentration across a selectively permeable membrane. What really drives osmosis

the difference in water concentration across a selectively permeable membrane

what contols the direction of a molecule such as oxygen involved in passive transport

the direction of the oxygen concentration gradient

In an oil based nonpolar environment, phospholids would arrange themselves so that ehy

would stay together but in a reverse orientation with their tals projecting outward