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Each lesson in this course will introduce you to new concepts and principles—and some lessons may require you to think about biology in new ways. By the end of this lesson, you should be able to complete these tasks.
- Explain the evidence that scientists have to support the idea that signaling mechanisms in cells have evolved over hundreds of millions of years.
- Describe the purpose of quorum sensing in bacteria.
- Explain the relationship between regular teeth brushing, biofilms, and quorum sensing.
- Explain why gap junctions and plasmodesmata can be described as analogous structures.
- Compare cell-to-cell recognition to paracrine signaling, synaptic signaling, and endocrine signaling.
- List the three phases of a typical signal transduction pathway.
- Explain why a signaling molecule may impact one cell but not another cell.
- Explain why the injection of epinephrine into a cell does not yield a cellular response.
- Hypothesize why epinephrine may cause a cellular response when injected outside of a liver cell, but causes no response when injected outside of a skin cell.
