A laboratory Text book of Biochemistry, Molecular Biology and Microbiology is intended to prepare the undergraduate, postgraduate and research students to perform basic experiments on various aspects of bioscience and biotechnology. Moreover, in the Semester system of teaching it is necessary to explore experiments which are not lengthy and easily completed within contact hours. Initially the book deals with dilutions, pH, buffers, units of measurements and calculations. This is followed by lab safety rules which is very important for any student working with chemicals for their and safety of others. This book emphasizes on principles, reagent preparations and procedures related to experiments, which will be handy for students from different scientific backgrounds. A number of methods are available in the literature for quantification of various molecules. This book does not present all the available methods but based on experience it contains commonly used methods, which students should know. The methods have been written in a manner for direct practical use in the laboratory. This work has originated as a result of numerous requests from my students for eased out and explanatory methods pertaining to biochemistry, biotechnology, microbiology and others. The section on testing of adulterants is of much use for common mass because most of the food products we eat are adulterated. The approach is rather simple with the use of very easily available chemicals and the tests can be performed even in house. It is hoped that the reliable assays presented in this manual will help the students and research scholars to get to basics of experiments and various aspects associated with it.