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Biology 1201 Quiz 37
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Multiple Choice Questions
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True or false? Cone cells are color photoreceptors that use different retinal molecules to absorb different wavelengths of light.
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True
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False
Which part of the eye bends light to focus it on the retina?
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Fovea
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Lens
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The pupil is the small opening in the center of the iris through which light initially passes.
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The retinal molecule changes shape when it absorbs light.
Why is an action potential an all-or-none response to stimuli?
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The retinal molecule changes shape when it absorbs light.
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Because voltage-gated ion channels open when membrane potential passes a particular level
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The pupil is the small opening in the center of the iris through which light initially passes.
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Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
Which of the following statements about photoreception is true?
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It contains many light-sensing columns called ommatidia.
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Because voltage-gated ion channels open when membrane potential passes a particular level
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The retinal molecule changes shape when it absorbs light.
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The pupil is the small opening in the center of the iris through which light initially passes.
Which of the following statements does not describe a vertebrate eye?
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The pupil is the small opening in the center of the iris through which light initially passes.
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Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
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It contains many light-sensing columns called ommatidia.
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The retinal molecule changes shape when it absorbs light.
If the membrane potential of a neuron decreases, the membrane potential _____.
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becomes less negative
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It contains many light-sensing columns called ommatidia.
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Because voltage-gated ion channels open when membrane potential passes a particular level
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The pupil is the small opening in the center of the iris through which light initially passes.
The plasma membrane of a neuron has voltage-gated sodium and potassium channels. What is the effect of membrane depolarization on these channels?
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Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
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Membrane depolarization first opens sodium channels and then opens potassium channels.
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Because voltage-gated ion channels open when membrane potential passes a particular level
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The pupil is the small opening in the center of the iris through which light initially passes.
Which part of the eye is the opening through which light initially passes?
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The pupil is the small opening in the center of the iris through which light initially passes.
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Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
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It contains many light-sensing columns called ommatidia.
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The retinal molecule changes shape when it absorbs light.
Identify the correct statement(s) about the resting membrane potential of a cell.
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It contains many light-sensing columns called ommatidia.
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Concentration gradients of potassium (K+) and sodium (Na+) across the plasma membrane represent potential energy.Potassium (K+) and sodium (Na+) gradients are maintained by active transport in a resting mammalian neuron.
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Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
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The retinal molecule changes shape when it absorbs light.
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