Inside every living cell is a remarkable molecule that contains all the instructions the cell needs to perform its tasks, and all the instructions to make an exact copy of the entire plant or animal Plant cells are enclosed in a rigid membrane of cellulose. Unlike animal cells, plant cells contain small organelles called chloroplasts. The chloroplasts are like tiny solar converters, and they enable plants to trap the energy from the Sun in a process called photosynthesis . Plant cells also contain a large space filled with air or water called a vacuole. CELL A living cell is a squidgy case containing a jelly-like mixture of chemicals called the cytoplasm .
Cells gain their strength by clumping together with other cells.
Membrane Holding each cell together is a thin skin called the membrane . Although it holds the cytoplasm in place, the membrane lets certain chemicals in to feed the cell and lets waste out. The cytoplasm acts as a storeroom of molecules for the enlargement and repair of structures inside the cell. It surrounds an intricate set of structures called organelles . Different cells have different organelles, each with its own function.