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| 1 | |
A receptor potential: |
| | 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 |
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| 2 | |
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? |
| | A) | Sensory neurons would not fire in response to high temperatures. |
| | B) | Sensory neurons would continually fire. |
| | C) | The individual would feel pain if subject to high temperatures. |
| | D) | The individual would be very sensitive to high temperatures. |
| | E) | None of these would occur |
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| 3 | |
What would happen if you had an unusually short basilar membrane in the cochlea? |
| | 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) | all of these are correct |
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| 4 | |
Within a taste bud, the chemicals that produce salty and sour tastes: |
| | 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 these |
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| 5 | |
In the vertebrate eye photoreceptor cells detect light. What condition(s) occur in the dark? |
| | 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. |
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| 6 | |
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? |
| | 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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| 7 | |
For all different types of sensory receptors, it is true that as the intensity of the stimulus increases the: |
| | A) | amplitude of the action potential increases. |
| | B) | frequency of the action potentials increase. |
| | C) | threshold level for the action potential decreases. |
| | D) | frequency of the action potentials decrease. |
| | E) | none of these |
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| 8 | |
Which of the following is NOT a mechanoreceptor? |
| | A) | proprioceptor |
| | B) | thermoreceptor |
| | C) | nociceptor |
| | D) | baroreceptor |
| | E) | kinoreceptor |
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| 9 | |
The detection of sound waves works better in air than in water. |
| | A) | True |
| | B) | False |
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| 10 | |
Flies taste with their feet. |
| | A) | True |
| | B) | False |
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| 11 | |
Which phyla have independently evolved well-developed, image-forming eyes? |
| | A) | platyhelminthes, arthropoda, mollusca, chordata |
| | B) | arthropoda, mollusca, echinodermata, chordata |
| | C) | annelida, arthropoda, mollusca, chordata |
| | D) | annelida, arthropoda, chordate |
| | E) | none of these is correct. |
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| 12 | |
Some vertebrates can detect: |
| | A) | infrared radiation. |
| | B) | magnetic fields. |
| | C) | electric currents. |
| | D) | all of these |
| | E) | none of these |
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| 13 | |
A proprioceptor detects |
| | A) | taste. |
| | B) | pain. |
| | C) | gravity. |
| | D) | color. |
| | E) | temperature. |
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| 14 | |
The most sensitive vertebrate chemoreceptors known are the |
| | A) | organs of Corti of bats. |
| | B) | organs of Corti of humans. |
| | C) | rods and cones of mammals. |
| | D) | olfactory receptors of mammals. |
| | E) | taste receptors of fishes. |
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| 15 | |
In humans, the receptor cells for hearing are located in the |
| | A) | tympanic membrane. |
| | B) | cochlea. |
| | C) | semicircular canals. |
| | D) | Eustachian tube. |
| | E) | oval window. |
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