SNHU BIOL 4310: VISION AND PHOTORECEPTION
EXAM 1 2025 |150 QUESTIONS WITH ACCURATE
SOLUTIONS
1. Describe how horizontal cells contribute to the processing of visual
information in the retina.
Horizontal cells mediate interactions between photoreceptors
and bipolar cells, enhancing contrast through lateral inhibition.
Horizontal cells directly transduce light signals into neural
impulses.
Horizontal cells are responsible for color detection in the retina.
Horizontal cells connect ganglion cells to photoreceptors.
2. If a new species is discovered with unique photopigments, how might
microspectrophotometry be utilized to investigate its visual capabilities?
By analyzing the structural composition of its eyes to infer visual
capabilities.
By assessing the environmental light conditions it inhabits.
By comparing its visual behavior to that of known species.
By measuring the absorption spectra of its photopigments to
determine their sensitivity to different wavelengths of light.
3. Vision or Sight: What is the visible light range for the electromagnetic
spectrum?
400-700
1-100
200-800
,100-600
,4. In a study measuring the effect of light direction on anxiety levels in
subjects, which measurements would be most relevant to assess the
impact of light on visual perception?
Spectral power and wavelength
Illuminance and contrast
Color temperature and brightness
Radiance and luminance
5. If a mutation occurs in the INAD protein that disrupts its scaffolding
function, what potential effect could this have on the invertebrate's ability
to perceive light?
Increased sensitivity to light
Impaired phototransduction
Improved visual acuity
Enhanced color vision
6. If a mutation affects the function of voltage gated potassium channels in
photoreceptors, what potential impact could this have on visual
processing?
It could lead to impaired repolarization of the photoreceptor
cells, resulting in altered signal transmission and potentially
affecting vision.
It would have no effect on visual processing as potassium
channels are not involved in phototransduction.
It would enhance the sensitivity of photoreceptors to light,
improving vision.
It would cause an increase in the production of photopigments,
enhancing visual acuity.
, 7. What type of cells do amacrine cells primarily contact in the retina?
Photoreceptor cells
Retinal pigment epithelium
Bipolar and ganglion cells
Horizontal cells
8. If researchers were to study the effects of another photoreceptor on
circadian rhythms in mice, what outcome might they expect if that
photoreceptor also plays a role similar to opn4?
Circadian phase shifting may be altered but not completely
eliminated.
Circadian phase shifting will increase significantly.
Circadian phase shifting will be completely abolished.
There will be no change in circadian phase shifting.
9. A light source has a wavelength of 1 × 10^−6 m. What is its frequency?
Assume c = 3 × 10^8 m/s.
0.33 × 10^-14 Hz
0.003 Hz
3 × 10^6 Hz
3 × 10^14 Hz
3 × 10^2 Hz
10. Describe the location and function of bipolar cells within the retina.
Bipolar cells are responsible for detecting color and are located
in the outer plexiform layer.
Bipolar cells have their cell bodies in the inner nuclear layer
(INL) and their axons in the inner plexiform layer (IPL),
EXAM 1 2025 |150 QUESTIONS WITH ACCURATE
SOLUTIONS
1. Describe how horizontal cells contribute to the processing of visual
information in the retina.
Horizontal cells mediate interactions between photoreceptors
and bipolar cells, enhancing contrast through lateral inhibition.
Horizontal cells directly transduce light signals into neural
impulses.
Horizontal cells are responsible for color detection in the retina.
Horizontal cells connect ganglion cells to photoreceptors.
2. If a new species is discovered with unique photopigments, how might
microspectrophotometry be utilized to investigate its visual capabilities?
By analyzing the structural composition of its eyes to infer visual
capabilities.
By assessing the environmental light conditions it inhabits.
By comparing its visual behavior to that of known species.
By measuring the absorption spectra of its photopigments to
determine their sensitivity to different wavelengths of light.
3. Vision or Sight: What is the visible light range for the electromagnetic
spectrum?
400-700
1-100
200-800
,100-600
,4. In a study measuring the effect of light direction on anxiety levels in
subjects, which measurements would be most relevant to assess the
impact of light on visual perception?
Spectral power and wavelength
Illuminance and contrast
Color temperature and brightness
Radiance and luminance
5. If a mutation occurs in the INAD protein that disrupts its scaffolding
function, what potential effect could this have on the invertebrate's ability
to perceive light?
Increased sensitivity to light
Impaired phototransduction
Improved visual acuity
Enhanced color vision
6. If a mutation affects the function of voltage gated potassium channels in
photoreceptors, what potential impact could this have on visual
processing?
It could lead to impaired repolarization of the photoreceptor
cells, resulting in altered signal transmission and potentially
affecting vision.
It would have no effect on visual processing as potassium
channels are not involved in phototransduction.
It would enhance the sensitivity of photoreceptors to light,
improving vision.
It would cause an increase in the production of photopigments,
enhancing visual acuity.
, 7. What type of cells do amacrine cells primarily contact in the retina?
Photoreceptor cells
Retinal pigment epithelium
Bipolar and ganglion cells
Horizontal cells
8. If researchers were to study the effects of another photoreceptor on
circadian rhythms in mice, what outcome might they expect if that
photoreceptor also plays a role similar to opn4?
Circadian phase shifting may be altered but not completely
eliminated.
Circadian phase shifting will increase significantly.
Circadian phase shifting will be completely abolished.
There will be no change in circadian phase shifting.
9. A light source has a wavelength of 1 × 10^−6 m. What is its frequency?
Assume c = 3 × 10^8 m/s.
0.33 × 10^-14 Hz
0.003 Hz
3 × 10^6 Hz
3 × 10^14 Hz
3 × 10^2 Hz
10. Describe the location and function of bipolar cells within the retina.
Bipolar cells are responsible for detecting color and are located
in the outer plexiform layer.
Bipolar cells have their cell bodies in the inner nuclear layer
(INL) and their axons in the inner plexiform layer (IPL),
