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