(i) For non-lipid soluble signalling molecules, which class of receptors are required? Please give two examples of non-lipid signalling molecules and explain how these signalling molecules induce intracellular signalling to change the cell behaviour. (ii) Compare and contrast beta catenin and p53 signalling, and explain their functions in the nucleus.

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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.