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Chapter 11: Problem 18

Which of the following proteins is a major constituent of synaptic ribbons? a. Retinol dehydrogenase b. Melanin c. Ribeye d. RGS/G \(\beta 5\) e. Bestrophin

Short Answer

Expert verified
Answer: Ribeye

Step by step solution

01

Understand synaptic ribbons

Synaptic ribbons are electron-dense structures found at the active zones of certain synapses, particularly in sensory neurons, such as photoreceptors and hair cells. These structures play an important role in the release of neurotransmitters to facilitate communication between neurons.
02

Review the list of proteins

The given list of proteins includes: a. Retinol dehydrogenase b. Melanin c. Ribeye d. RGS/Gß5 e. Bestrophin
03

Eliminate irrelevant proteins

a. Retinol dehydrogenase: an enzyme involved in the metabolism of retinoids, not related to synaptic ribbons. b. Melanin: a pigment responsible for skin and hair color, not related to synaptic ribbons. d. RGS/Gß5: a complex that regulates G protein signaling, not directly related to synaptic ribbons. e. Bestrophin: a calcium-activated chloride channel protein, not directly related to synaptic ribbons.
04

Identify the correct protein

c. Ribeye: Ribeye is a major protein component of synaptic ribbons. It is essential for the formation and function of these structures and is found at the core of synaptic ribbons.
05

Conclusion

The major constituent of synaptic ribbons is Ribeye (c).

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Most popular questions from this chapter

Which of the following statements is true about \(\mathrm{ON}\) and OFF type retinal bipolar cells? a. ON bipolar cells possess KA/AMPA receptors and OFF bipolar cells possess NMDA receptors. b. ON bipolar cells possess NMDA receptors and OFF bipolar cells possess mGluR6. c. ON bipolar cells possess mGluR6 and OFF bipolar cells possess NMDA receptors. d. ON bipolar cells possess mGluR6 and OFF bipolar cells possess KA/AMPA receptors. e. ON bipolar cells possess KA/AMPA receptors and OFF bipolar cells possess mGluR6.

Which of the following is the main reason that retinal detachment leads to blindness? a. The retina dies from oxygen deprivation after separating the retina from the choroidal blood supply. b. Separation of the RPE and photoreceptor outer segments prevents visual pigment recycling. c. Retinal detachment shears off photoreceptor outer segments because they are covalently bound to the RPE. d. Photoreceptors die because of the inability of the RPE to phagocytose photoreceptor outer segments. e. Retinal detachment moves the retina out of the optical plane of focus.

Which of the following is NOT considered to be a major role of Müller cells? a. Spatial redistribution of potassium b. Neurotransmitter uptake and removal c. Homeostatic maintenance of retinal \(\mathrm{pH}\) levels d. Glycogen storage e. Promoting retinal adhesion to the back of the eye

In which layer of the retina do bipolar cell terminals contact ganglion cell dendrites? a. Outer nuclear layer b. Outer plexiform layer c. Inner nuclear layer d. Inner plexiform layer e. Ganglion cell layer

Briefly summarize the major steps in phototransduction in rods.
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