True or false? Cone cells are color photoreceptors that use different retinal molecules to absorb different wavelengths of light.
  • True
  • False
Which part of the eye bends light to focus it on the retina?
  • Fovea
  • Lens
  • The pupil is the small opening in the center of the iris through which light initially passes.
  • The retinal molecule changes shape when it absorbs light.
Why is an action potential an all-or-none response to stimuli?
  • The retinal molecule changes shape when it absorbs light.
  • Because voltage-gated ion channels open when membrane potential passes a particular level
  • The pupil is the small opening in the center of the iris through which light initially passes.
  • Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
Which of the following statements about photoreception is true?
  • It contains many light-sensing columns called ommatidia.
  • Because voltage-gated ion channels open when membrane potential passes a particular level
  • The retinal molecule changes shape when it absorbs light.
  • 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?
  • The pupil is the small opening in the center of the iris through which light initially passes.
  • Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
  • It contains many light-sensing columns called ommatidia.
  • The retinal molecule changes shape when it absorbs light.
If the membrane potential of a neuron decreases, the membrane potential _____.
  • becomes less negative
  • It contains many light-sensing columns called ommatidia.
  • Because voltage-gated ion channels open when membrane potential passes a particular level
  • 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?
  • Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
  • Membrane depolarization first opens sodium channels and then opens potassium channels.
  • Because voltage-gated ion channels open when membrane potential passes a particular level
  • 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?
  • The pupil is the small opening in the center of the iris through which light initially passes.
  • Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
  • It contains many light-sensing columns called ommatidia.
  • The retinal molecule changes shape when it absorbs light.
Identify the correct statement(s) about the resting membrane potential of a cell.
  • It contains many light-sensing columns called ommatidia.
  • 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.
  • Inactivation of voltage-gated sodium channels and the opening of voltage-gated potassium channels
  • The retinal molecule changes shape when it absorbs light.
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