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An understanding of Biology is essential for the students of life sciences disciplines. The main part to this book is Introduction to Cell Biology. It starts with the introduction to the basis of life. The objective is to provide students an understanding of the very basic molecules of life-DNA, RNA, proteins and how these molecules, when form further complex molecules like carbohydrates, vitamiris and lipids, then functioning of body takes place. Cell cycle, Physical structure of the cell, Cell Membrane, Cytoplasm and its Organelles (Nucleus, Mitochondria, Golgi, Endoplasmic Reticulum, Lysosomes, Peroxisomes, Ribosomes, Chloroplasts will be discussed in this part. This part will also cover the transport of substances through the cell membrane, as it serves the basis of all the cellular mechanisms. Osmosis, Diffusion and its types, Active transport and Passive transport, Membrane potential, Action Potential.