Which of the Following Explains Why Introducing the MyoD Protein

question 33

Multiple Choice

Which of the following explains why introducing the MyoD protein into a fat cell causes that cell to become a muscle cell but adding it to a neuron will have no effect?

• A) Fat cells are undifferentiated, the MyoD protein causes them to differentiate.
• B) Neurons are a differentiation step after muscle cells, they cannot go "backwards."
• C) Muscle-specific gene expression requires a protein that neurons do not make.
• D) MyoD is causes positive feedback of MyoD expression in fats cells but not neurons.

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