EXAM ONE BIOLOGY 580 2004

ANSWER ONLY THE A OR B PART OF EACH QUESTION. 14.3 POINTS EACH. Don’t bother to rewrite the questions, just indicate A or B

1. A. Identify and describe two kinds of cell surface membrane domains and their different functions.

B. Describe three different domains of membrane integral proteins and their different functions.

2. A. Describe how different G-proteins can cause stimulation or inhibition in the postsynaptic cell. Give examples.

B. Discuss three ways second messages can be produced in postsynaptic nerve or muscle signal transduction- give examples of what kinds of receptors are involved.

3. A. Tell me what is changing in this equation below, in what order, when a nerve is stimulated by acetylcholine and fires an action potential? You do not need to rewrite the equation.

B. Tell me what is changing in this equation in what order when a nerve is stimulated by glycine. You do not need to rewrite the equation.

4. A. How are membrane activities of sensory rods and cones of retina different from ordinary neurons when resting and when they are stimulated?

2. Why is high K+ important in the endolymph of the Organ of Corti for hearing?

5. A. How can cells prevent excess swelling or shrinking? Be specific.

B. What kinds of controls are there for regulating pumps or gates and channels or transporters?

6. A. Using the diagram explain how two different drugs can have effects on a particular part of the synapse

B. Describe either facilitation or inhibition on the presynaptic cell and the kinds of signals involved.

7. A Describe one active and one passive membrane transporter and how are they important in maintaining homeostasis?

B. How can protein subunits make a pore or channel in the membrane specific for certain ions?