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1. What is the function of TRP and TRPL in the phototransduction cascade within Drosophila photoreceptors?

A. TRP and TRPL are ion exchanger pumps

B. TRP and TRPL are messenger proteins that when activated leads to the opening of ion channels

C. The activation of TRP and TRPL leads to a depolarization of the photoreceptors

D. TRP and TRPL are ion channels that are permeable to Na only

E. TRP and TRPL are ion channels that are permeable to Na and Ca

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Hubert Koch
Hubert KochLv2
29 Sep 2019
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Related questions

TRUE/ FALSE - EXPLAIN

"A. All voltage-gated ion channels responsible for generating the action potential are composed of 3 subunits, each of which contains 7 transmembrane segments."
"B. Cystic fibrosis is caused by a mutation that causes a type of K+ ion channel to become overactive."
"C. The predatory marine snail Conus geographus secretes m-conotoxin, which blocks inactivation of voltage- gated Na-channels. In contrast, frogs of the genus Dendrobates produce batrachotoxin, which blocks voltage-gated Na- and K-channels."
"D. The early current in the action potential is carried mainly by leak channels permeable to potassium."
"E. The threshold of an action potential can be increased by hyperpolarizing the neuron immediately before stimulating the action potential."

6. Consider the presence of hemoglobin in the catheter bag. Whatsymptom would this loss of

hemoglobin most strongly and immediately be linked to in thepatient?

A. Loss of blood volume

B. Loss of heartbeat

C. Drop in blood oxygen saturation

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When a neuron is stimulated, the area of the membrane at thepoint of stimulation becomes
more permeable to Na+. If a cell starts at resting potential(-70mv), and is then stimulated:
A. The membrane voltage will become < -70mV, because Na+will move OUT of the cell.
B. The membrane voltage will become > -70mV, because Na+will move OUT of the cell.
C. The membrane voltage will become < -70mV because Na+will move INTO the cell.
D. The membrane voltage will become > -70mV because Na+will move INTO the cell.

. At the peak of the action potential, the Na+ voltage-gatedchannels close, and K+ voltage-gated
channels open in response to the positive membrane potential.In order to return the cell to its
negative resting potential quickly:
A. K+ will diffuse along its concentration gradient INTO thecell.
B. K+ will diffuse along its concentration gradient OUT of thecell.
C. Na+ will reverse its direction of diffusion OUT of thecell.
D. The sodium-potassium pump will move Na+ OUT of the cell andK+ INTO the cell.
E. None of the above would return the cell to its negativeresting potential quickly.

You experiment with higher concentrations of toxin and findcases when the cell could not
repolarize at all or, if it began to repolarize, itimmediately depolarized again. This tells you that
the toxin:
A. Prevents voltage-gated K+ channels from opening.
B. Increases the speed that the Na+ ion channels open.
C. Prevents the Na+ ion channels from closing.
D. Makes the Na+ ion channels close too soon.
E. Doesn

Question 8

What is the function of rhodopsin, opsin, and retinal in the Drosophila photoreceptors?

A.

Retinal is the trans-membrane protein that is sensitive to light
B.

The confirmation change from cic-retinal to all-trans retinal leads to the activation of a G-protein
C.

cic-retinal is converted to all-trans retinal by light
D.

all-trans retinal is converted to cic-retinal by light
E.

Rhodopsin is an ion channel that opens up when it absorbs light
F.

Rhodopsin is composed of a trans-membrane protein and a light-absorbing molecule
G.

The confirmation change from all-trans retinal to cic-retinal leads to the activation of a G-protein

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