Written By: Membrane, in biology, the thin layer that forms the outer boundary of a living cell or of an internal cell compartment. The outer boundary is the plasma membrane, and the compartments enclosed by internal membranes are called organelles.
The main purpose of the INTRODUCTION is to give a description of the problem that will be addressed. In this section the researcher might discuss the nature of the research, the purpose of the research, the significance of the research problem, and the research question(s) to be addressed. Three essential parts of a good introduction are: RATIONALE.
At the end of your introduction, offer your hypothesis and describe what you expected to find in your experiment or study. Tips: 1  Use 3x5 note cards to write down notes and sources. 2  Look in professional psychology journals for examples of introductions.  Remember to cite your sources.