Principle objective of this lecture is to present on Cell Structure: Cell to Organism. Here briefly describe on some internal organism of Cell Structure. Chloroplasts: Green organelles that make food found only in plant cells. Chlorophyll: Captures sunlight energy that is used to produce food called glucose. Mitochondria: Organelles that release energy from food. Ribosomes: Make proteins; they are made in the nucleolus. Here also briefly focus on Endoplasmic Reticulum, Golgi Bodies, Vacuoles etc.