Biology, Eighth Edition (Raven)

Chapter 45: Sensory Systems

Post Test

A receptor potential: (p .900)
A)is a depolarization of a sensory receptor.
B)increases in size with distance from its source.
C)always causes an action potential.
D)only occurs above a threshold value of the stimulus.
E)all of the above
What would be the consequence(s) of having a mutation that blocked the flow of sodium and calcium ions into transient receptor potential (TRP) ion channels? (p. 901)
A)Sensory neurons would not fire in response to high temperatures.
B)Sensory neurons would continually fire.
C)The individual would feel no pain if subject to high temperatures.
D)The individual would be very sensitive to high temperatures.
E)both a and c
What would happen if you had an unusually short basilar membrane in the cochlea? (p. 904)
A)Your sense of balance would be affected.
B)You would not be able to detect very high frequency sounds.
C)You would not be able to detect very low frequency sounds.
D)All sounds would be muffled.
E)both a and c
Within a taste bud, the chemicals that produce salty and sour tastes: (p. 908)
A)act indirectly by binding to G protein-coupled receptors.
B)act directly on sensory neurons.
C)act directly through ion channels.
D)act directly by binding to G protein-coupled receptors.
E)none of the above
In the vertebrate eye photoreceptor cells detect light. What condition(s) occur in the dark? (p. 914)
A)cGMP levels are high.
B)cGMP levels are low.
C)Rhodopsin activates a G protein that stimulates phosphodiesterase.
D)An influx of Ca+ ions is prevented.
E)Na+ channels are closed.
Homing pigeons have the ability to detect the Earth's magnetic field and use it for orientation when flying under overcast conditions. What would you predict if you fixed a small bar magnet on a pigeon's head and released it on a cloudy day? (p.916 )
A)It will fly off in the correct direction towards home.
B)It will fly off in exactly the opposite direction of home.
C)It will be unable to fly at all.
D)It will fly off in a random direction.
E)It's impossible to predict what will happen.
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