#Question id: 1388
#Unit 4. Cell Communication and Cell Signaling
When Lucifer yellow, a small dye, is injected into a neuron of the retina, neighboring neurons become rapidly labeled. If the retina is incubated in dopamine prior to Lucifer yellow injection, only the injected neuron becomes labeled. These findings suggest which of the following?
I. Neurons of the retina communicate via gap junctions.
II. Dopamine is transferred between cells via gap junctions.
III. Dopamine decreases the permeability of gap junctions.
#Question id: 1389
#Unit 4. Cell Communication and Cell Signaling
Why has C. elegans proven to be a useful model for understanding apoptosis?
#Question id: 1390
#Unit 4. Cell Communication and Cell Signaling
Which of the following statements describes the events of apoptosis?
#Question id: 1391
#Unit 4. Cell Communication and Cell Signaling
If an adult person has a faulty version of the human analog to ced-4 of the nematode, which of the following is most likely to result?
#Question id: 1392
#Unit 4. Cell Communication and Cell Signaling
In the nematode C. elegans, ced-9 prevents apoptosis in a normal cell in which of the following ways?
#Question id: 1393
#Unit 4. Cell Communication and Cell Signaling
In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously. Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signalling?