MCQ Questions
Q.1.
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
Q.2.
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.
Q.3.
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
Q.4.
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.
Q.5.
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.
Q.6.
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.
Q.7.
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.
Q.8.
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.
Q.9.
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.