Exam 5: Membrane Transport and Cell Signaling

The secretion of a signal molecule by a cell into the local environment,followed by a response by a number of cells in the immediate vicinity,is an example of

Phosphatase enzymes in signal transduction pathways function primarily to

An accident victim has lost a lot of blood due to a serious injury.Replacement of the lost body fluids with a hypertonic saline solution would have which of the following results?

Proton pumps are used in various ways by members of every domain of organisms: Bacteria,Archaea,and Eukarya.What does this most probably mean?

Familial hypercholesterolemia results in extremely high levels of cholesterol in the blood.The underlying cause of this disease is

Immediately after a membrane receptor protein binds to its ligand,which of the following processes occurs?

The primary function of kinases in signal transduction is to

Water can move quickly through the plasma membrane of some cells because

Cell membranes in plants that thrive in extreme cold are able to remain fluid by

The protein,lipid,and carbohydrate compositions of the cytoplasmic and extracellular sides of membranes are different from one another.Why is this the case?

Carrot slices placed in a 0.2 M salt solution for several hours become flaccid (limp).Carrot slices placed in fresh water for several hours become turgid (stiff).From this we can deduce that

In what way do the membranes of a eukaryotic cell vary?

Which of the following membrane activities requires energy from ATP hydrolysis?

Which of the following is true of integral membrane proteins?

You are working on a team that is designing a new drug.In order for this drug to work,it must enter the cytoplasm of specific target cells.Which of the following would be a factor that determines whether the molecule selectively enters the target cells?

Figure 5.5 -In Figure 5.5,the dots in the space between the two structures represent which of the following types of molecules?

Which of the following is the greatest advantage of having multiple steps in a transduction pathway?

How do unsaturated fatty acids help keep any membrane more fluid at lower temperatures?

Mammalian blood contains the equivalent of 0.15 M NaCl.Seawater contains the equivalent of 0.45 M NaCl.What will happen if red blood cells are transferred to seawater?

Which of the following molecules would you expect to diffuse through the lipid bilayer of a plasma membrane most rapidly?