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.
JOHNSONCOUNTY COMMUNITYCOLLEGE WRITING CENTER. TheParagraph: Unity, Order (Emphasis),Coherence. Definition Aparagraph is a group of closelyÂ­relatedsentences which deal with and develop one idea. The first sentence of a paragraph usually introduces the idea; it is called the topic sentence. All writing of any length is, as you know, divided into paragraphs, and the first lineof a new paragraph is indented. Structure Bythe structure of a paragraph is meant the building or composition of it. The definition ofa paragraph indicates that the sentences must be related; they must have a particular structure. This structure is determined by the relationship of the ideas, and it is by constructingthe paragraph properly that you develop the idea. To develop an idea is to unfoldor reveal it.