5
Fill-In:
There are ___1_____varieties of cones. One type responds most vigorously to __2__ light,
another to ______3____ light, and still anther to ___4____light. The ability to see
intermediate colors such as purple results from the fact that more than one cone type is being
stimulated____5_____. Lack of all color receptors results in ___6___. Because this condition
is sex linked, it occurs most commonly in ___7___. Black and white or dim light vision is a
function of the ____8___. The density of cones is greatest in the ____9_____ whereas rods are
In the cochlea, pressure transmitted to the _____1______of the oval window causes the
___2____ of the cochlear duct to vibrate. This vibration causes stimulation of mechano-
receptors, called ________3_______. During stimulation of these receptors, bundles of actin
myofilaments, called _______4________, are bent against the overhanging ________5_______.
This deformation causes channels for Na and Ca to ________6________ (open/close) and
consequent (depolarization/hyperpolarization) of the cells. The region of the cochlear duct
that contains the receptor cells is called the _______7___________.
Membrane Transport
Choose A if the statement refers to SIMPLE DIFFUSION, B if the statement refers to FACILI-
TATED DIFFUSION, C if the statement applies to BOTH SIMPLE AND FACILITATED DIFFUSION,
and D if the statement applies to neither.
1. Movement of molecules from an area of high concentration to an area of low concentration.
2. The use of ATP to move molecues.
3. A form of mediate transport
4. Conform(s) to the properties of specificity, competition and saturation
Short Answer
1. Which two properties of molecules influence whether that molecule can cross the cell
membrane?
2. Distinguish between passive and active transport.
3. Distinguish between co-transport, antiport, and symport.
4. Distinguish between penetrating solutes and non-penetrating solutes.
5. If the Na-K pump stopped operating in a nerve cell, what eventually would happen to the
polarity of the cell?
6. Distinguish between endocytosis and Exocytosis.
7. Distingusih between isotonic, hypertonic, and hypotonic
8. Design an experiment to test whether molecular weight does indeed influence the rate of
diffusion.
9. Besides the Na/K pump found in the plasma membrane what other types of membrane
pumps might be found in a cell and indicate where specifically they would be located.
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