Multiple Choice
Which of the following is likely to be a response by a receptor protein to an approaching signal molecule?
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10. Cell Signaling
Introduction to Cell Signaling
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Evidence that cell signaling evolved early in the history of life comes from __________.
A
comparative studies of mitochondrial DNA
B
comparative studies of ribosomal RNA
C
the fossil record
D
the study of protein receptors embedded in the nuclear membrane
E
the similarity of cell-signaling mechanisms in organisms that have a very distant common ancestor
Verified step by step guidance1
Understand that cell signaling is a fundamental process that allows cells to communicate with each other, which is crucial for the functioning of multicellular organisms.
Recognize that the question is asking for evidence of the early evolution of cell signaling mechanisms.
Consider that if cell signaling mechanisms are similar across a wide range of organisms, it suggests that these mechanisms were present in a common ancestor and have been conserved through evolution.
Note that the similarity of cell-signaling mechanisms in organisms with a very distant common ancestor indicates that these mechanisms evolved early and have been maintained due to their essential role in cellular communication.
Conclude that the correct evidence for the early evolution of cell signaling is the similarity of these mechanisms in diverse organisms, rather than specific studies of DNA, RNA, fossils, or nuclear membrane proteins.
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