This term describes any signal molecule (neurotransmitter, cytokine, etc.) that binds with receptors on nearby target cells. Type the best answer into the text box below:

The study of how communication is influenced by space and distance is called

The third step in Knapp’s Model of Relational Stages is

When DNA replication occurs, each parental strand of a chromosome is used as a template for a newly-synthesized daughter strand.  This strategy is called __________ and greatly minimizes replication errors. 

________ are molecules that bind to a receptor in such a way that they block the actual ligand from binding and thereby prevents the receptor from responding. Type the best answer into the text box below that completes this sentence:

Use the pull-down menus to insert the best terms that make this sentence true: When a monovalent cation channel opens, [blank1] will influx and [blank2] will efflux.

_______ initiate the production of phospholipid-derived second messengers.

A man has been having an affair for over a year. He has been telling his wife that he has to work late. Which of the following would describe this transgression?

All human genes only contain enough instructions to synthesize one protein.

After forming a complex with the ribosome, mature mRNA also interacts with a third molecule that delivers a distinct amino acid. This molecule is called _______.