In a given organism, exposure to a hormonal signal (e.g. epinephrine) triggers d

Question

In a given organism, exposure to a hormonal signal (e.g. epinephrine) triggers different responses in different tissues, and some tissues show no response at all. Which of the following is NOT a possible explanation for this phenomenon (except in rare exceptions)? Different cell ypes might express different (or no) receptors for the hormone. Different cells might express different signal transduction proteins. Different cells may have their DNA in different chromatin configurations that allow different genes to be activated. Different cell types might contain different genes that control different responses Activation of the same effector protein in different cells might cause different responses depending on what other proteins are expressed in the cells.

Explanation / Answer

The right answer for this question will be Option D.

All the cells in an organism's body will have the same DNA and same genes. However, the only difference between the cells of different tissues will be that the expression of different genes differs between the types of cells. For example, brain cells might express different proteins from what liver cells will express but the DNA and the genes will be same throughout the organism no matter what cell type or organ it is.

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