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In this section, we’ll look at different types of receptors and ligands, seeing how they interact to turn information from outside the cell into a change inside the cell.

How single-celled organisms use signals to communicate. Yeast mating types, bacterial quorum sensing, and biofilms.

The many different ways cells can change their behavior in response to a signal.

In this article, we'll examine the basic principles of how cells communicate with one another. We'll first look at how cell-cell signaling works, then consider different kinds of short- and long-range …

Explore cell communication and the cell cycle in AP Biology with videos, articles, and practice questions on Khan Academy.

Direct contact involves gap junctions or complementary surface proteins. Paracrine communication happens over short distances, while endocrine signaling involves hormones …

Cells can communicate directly through contact or indirectly via chemical signaling. This communication can occur over short distances, such as between neurons, or long distances, …

Remember that different cell types express different receptors. Some receptors are general, meaning that they can identify a self-produced molecule versus a potential threat (and that’s …

Introduction In the article on cell cycle checkpoints, we looked at the why of cell cycle transitions: the factors that a cell considers when deciding whether or not to move forward through the cell …