Exam 5: Cell Membrane Structure and Function

Two aqueous solutions are separated by a selectively permeable membrane that allows water to pass through but does not allow starch to pass through. Solution A is 10% starch and solution B is 5% starch. What will occur?

The gases O₂ and CO₂ enter or leave a plant cell by

In biological membranes, the phospholipids are arranged in a

When substances move across a plasma membrane and down concentration gradients, this is called

Distinguish among the three types of endocytosis: pinocytosis, receptor- mediated endocytosis, and phagocytosis.

Carrier molecules in the plasma membrane are required only for active transport.

The portion of the cell membrane is responsible for the isolating function of the membrane, whereas the portion regulates exchange and communication with the environment.

Which of the following types of membrane proteins are responsible for maintaining cell shape by linking the membrane protein with the cytoskeleton?

When a mouse cell and a human cell are fused, the membrane proteins of the two cells become uniformly distributed over the surface of the hybrid cell. This occurs because

Compare and contrast osmosis and simple diffusion.

How does the cell membrane act as a "gatekeeper" for the cell?

The urinary bladder is protected from leaking by cell- to- cell junctions called

The substances in cell membranes that form a barrier to the movement of materials across the membrane are

The bacterium Vibrio cholerae releases a toxin that blocks a channel protein in the membranes of cells that line the intestine. This toxin prevents the movement of sodium ions from the inside of the intestine into cells. If the sodium ions could not move into the cells, how would this affect the movement of water between the inside of the intestine and the cells?

Protein channels that provide passage for hormones and nutrients between animal cells are termed

Which of the following occurs as an enzyme produced by a cell is secreted from the cell?

Which process accounts for the movement of solid particles (such as food) into some animal cells?

If a frog egg cell is placed into a hypotonic solution, it will

Suppose that plasma membranes were single layers of phospholipids rather than double layers, and the heads faced the extracellular fluid. The interior of this hypothetical cell would have to be

The hydrophobic tails of a phospholipid bilayer are oriented toward the