Here is a curly one for you, but use logic and you will get it.

A transcription factor protein is detectable in both the epithelial layer and in underlying mesenchymal cells. However, the factor only has an effect in the epithelial cells, causing their elongation. This is best explained by which of the following:

Question

Here is a curly one for you, but use logic and you will get it.  
 
  A transcription factor protein is detectable in both the epithelial layer and in underlying mesenchymal cells. However, the factor only has an effect in the epithelial cells, causing their elongation. This is best explained by which of the following:

Answer

The gene encoding the transcription factor is not expressed in mesenchymal cells

Answer

The gene is only present in the epithelial layer

Answer

The factor relies on another factor for its activity that is only expressed in epithelial cells

Answer

The factor binds to a cell surface receptor that is only present in epithelial cells

Crowdly

Here is a curly one for you, but use logic and you will get it. A transcri...

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