Which of the Following Poses the Best Evidence That Cell-Signaling

question 84

Multiple Choice

Which of the following poses the best evidence that cell-signaling pathways evolved early in the history of life?

• A)Cell-signaling pathways are seen in "primitive" cells such as bacteria and yeast.
• B)Bacteria and yeast cells may undertake quorum sensing.
• C)Signal transduction molecules identified in distantly related organisms are similar.
• D)Most signals in all types of cells are received by cell surface receptors.
• E)Signals in bacteria are hydrophobic and do not require a cell surface receptor.

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