In order to detect a signal (that is, to be a target cell), a neighbor cell must have the right receptor for that signal. When a signaling molecule binds to its receptor, it alters the shape or activity of the receptor, triggering a change inside of the cell. Signaling molecules are often called ligands, a general term for molecules that bind specifically to other molecules (such as receptors).
A chunk paragraph is just a way of developing your skill in writing - it is a style or format which forces you to explain your ideas and arguments. Here's you do chunk writing: Write your topic sentence.
MAIN IDEAS AND SUPPORTING DETAILS DEFINITION OF A PARAGRAPH â¢ A group or specially and intentionally related sentences; a thought unit; sentences that revolve around a single idea and is a writerâs attempt to develop an idea or part of an idea. Organization of a Paragraph 1. Statement of the main idea. 2. Elaboration of the main idea and supporting details. 3. Restatement of the main idea-summary of main ideas or conclusions. TOPIC The topic is the subject that the selection is about. The main idea can usually be located if you can determine what the topic is.