1. What do the top/bottom of this diagram refer to? It refers to 2. What are the two major groups of proteins in the ETC? 3. What concentration gradient exists across the top/bottom of this diagram? a. How is it made? b. What name is given to this type of gradient which explains the force it has? c. What is it used for? 4. There are the three types of movement shown on this diagram:

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.