2. Cell Chemistry & Cell Components

According to the map above, what kind of large molecule transport is also called the process of cell 'eating'?

List five important factors that influence diffusion rates.

In the following diagram, identify the type of solution (hypertonic, hypotonic, or isotonic) in which the red blood cells are immersed.

The transport of a certain molecule exhibits the following characteristics:

(1) The molecule moves down its concentration gradient;

(2) at concentrations above a given level, the rate of transport does not increase; and

(3) cellular energy is not required for transport to occur.

Which transport process is at work?

For diffusion to occur, there must be:

a. A selectively permeable membrane

b. Equal amounts of solute

c. A concentration difference

d. Some sort of carrier system

e. All of the above

Fresh water is a precious natural resource in Florida and it is said that supplies are dwindling. Desalinizing (removing salt from) ocean water has been recommended as a solution to the problem. Why shouldn't we drink salt water?

The process that transports solid objects such as bacteria into the cell is called

(a) Pinocytosis

(b) Phagocytosis

(c) Exocytosis

(d) Receptor-mediated endocytosis

(e) Channel-mediated transport