A particular gene is expressed in liver cells, but not in neurons, in response t
ID: 15137 • Letter: A
Question
A particular gene is expressed in liver cells, but not in neurons, in response to low blood sugar. When blood sugar is low, the pancreas produces and secretes glucagon, a hormone that signals liver cells to release glucose, into the bloodstream. Which of the following explanations best describes why the gene is expressed in liver cells but not in neurons.a. There are enhancers that control the gene’s expression present in the DNA in liver cells. Those enhancers are not present in neurons.
b. An activator that binds to an enhancer is present in liver cells but not in neurons.
c. Neurons will never encounter glucagon.
d. The gene is not present in neuron.
Explanation / Answer
A particular gene is expressed in liver cells, but not in neurons, in response to low blood sugar. When blood sugar is low, the pancreas produces and secretes glucagon, a hormone that signals liver cells to release glucose, into the bloodstream. Which of the following explanations best describes why the gene is expressed in liver cells but not in neurons.
a. There are enhancers that control the gene’s expression present in the DNA in liver cells. Those enhancers are not present in neurons.
b. An activator that binds to an enhancer is present in liver cells but not in neurons.
c. Neurons will never encounter glucagon.
d. The gene is not present in neuron.
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