CBNS 106 Practice Set 2 Exam UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Which of the following is FALSE about photoreceptors?
A. Cones are more concentrated in the fovea, while rods are more concentrated in the
periphery
B. RGCs connected to cones have a large receptive field because many cones converge onto
one retinal ganglion cell
C. Photoreceptors are the only cells that are directly responsive to light
D. Rods are sensitive to dim light, but get photobleached when exposed to bright light
E. Photoreceptors release neurotransmitters through graded depolarization - CORRECT
ANSWER B. RGCs connected to cones have a large receptive field because many
cones converge onto one retinal ganglion cell
Which is true of retinal ganglion cells but NOT true of bipolar cells.
A. They can have either OFF-center or ON-center receptive fields
B. Their receptive fields can overlap with each other
C. They allow us to process contrasts in light intensity
D. They fire action potentials
E. They release graded post-synaptic potentials - CORRECT ANSWER D. They fire
action potentials
Which of the following will produce the least amount of firing in an OFF-center ganglion
cell?
A. No light
B. A large spot of light that hits the surround only
C. A small spot of light in the center of the receptive field
D. A small spot of light in the surround of the receptive field
E. A large spot of light that hits both the center and the surround. - CORRECT
ANSWER C. A small spot of light in the center of the receptive field
, If a bipolar cell with an ON-center receptive field receives light in the surround only,
A. There will be a net increase in the action potential firing rate of RGCs
B. There will be a net decrease in the action potential firing rate of RGCs
C. There will be no action potentials released
D. Horizontal cells will hyperpolarize bipolar cells
E. Both B and D - CORRECT ANSWER E. Both B and D
Damage to the superior colliculus would result in which of the following?
A. Inability to process color and fine details of visual stimuli
B. Inability to transduce light into electrical signals
C. Inability to identify or describe visual stimuli
D. Inability to track an object's position in space
E. Inability to regulate the brain's "clock" and sleep/wake cycles - CORRECT
ANSWER D. Inability to track an object's position in space
What is the purpose of having multiple visuotopic maps across all six layers of the lateral
geniculate nucleus (LGN)?
A. To amplify weak signals from retinal ganglion cells
B. To process different aspects of the visual image
C. To preserve the relative size of objects in the visual field
D. To filter out unimportant stimuli
E. To integrate input from the left and right visual fields - CORRECT ANSWER B. To
process different aspects of the visual image
An object in the right center of the visual field would stimulate
A. The nasal hemiretina of both eyes
B. The nasal hemiretina of the left eye and the temporal hemiretina of the right eye
C. The nasal hemiretina of the right eye and the temporal hemiretina of the left eye
D. The temporal hemiretina of both eyes
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Which of the following is FALSE about photoreceptors?
A. Cones are more concentrated in the fovea, while rods are more concentrated in the
periphery
B. RGCs connected to cones have a large receptive field because many cones converge onto
one retinal ganglion cell
C. Photoreceptors are the only cells that are directly responsive to light
D. Rods are sensitive to dim light, but get photobleached when exposed to bright light
E. Photoreceptors release neurotransmitters through graded depolarization - CORRECT
ANSWER B. RGCs connected to cones have a large receptive field because many
cones converge onto one retinal ganglion cell
Which is true of retinal ganglion cells but NOT true of bipolar cells.
A. They can have either OFF-center or ON-center receptive fields
B. Their receptive fields can overlap with each other
C. They allow us to process contrasts in light intensity
D. They fire action potentials
E. They release graded post-synaptic potentials - CORRECT ANSWER D. They fire
action potentials
Which of the following will produce the least amount of firing in an OFF-center ganglion
cell?
A. No light
B. A large spot of light that hits the surround only
C. A small spot of light in the center of the receptive field
D. A small spot of light in the surround of the receptive field
E. A large spot of light that hits both the center and the surround. - CORRECT
ANSWER C. A small spot of light in the center of the receptive field
, If a bipolar cell with an ON-center receptive field receives light in the surround only,
A. There will be a net increase in the action potential firing rate of RGCs
B. There will be a net decrease in the action potential firing rate of RGCs
C. There will be no action potentials released
D. Horizontal cells will hyperpolarize bipolar cells
E. Both B and D - CORRECT ANSWER E. Both B and D
Damage to the superior colliculus would result in which of the following?
A. Inability to process color and fine details of visual stimuli
B. Inability to transduce light into electrical signals
C. Inability to identify or describe visual stimuli
D. Inability to track an object's position in space
E. Inability to regulate the brain's "clock" and sleep/wake cycles - CORRECT
ANSWER D. Inability to track an object's position in space
What is the purpose of having multiple visuotopic maps across all six layers of the lateral
geniculate nucleus (LGN)?
A. To amplify weak signals from retinal ganglion cells
B. To process different aspects of the visual image
C. To preserve the relative size of objects in the visual field
D. To filter out unimportant stimuli
E. To integrate input from the left and right visual fields - CORRECT ANSWER B. To
process different aspects of the visual image
An object in the right center of the visual field would stimulate
A. The nasal hemiretina of both eyes
B. The nasal hemiretina of the left eye and the temporal hemiretina of the right eye
C. The nasal hemiretina of the right eye and the temporal hemiretina of the left eye
D. The temporal hemiretina of both eyes
