DNA which is usually a single circular molecule float in the cytoplasm love the cell you chaotic cells contain a membrane-bound nucleus that holds all the DNA in one part to sell as well as many other organelles now let’s look at the function and each organelle in a you carry on Excel to gain an understanding up the inner workings at the cell. It’s helpful to think up to sell as the many city just like in a city a cell is made up of many parts that have their own functions in the cell these parts are called organelles which are explain next a plasma cell membrane is made up of a phospholipid by layer the by layer surrounds the cell protecting it and functions as a gate that allows molecules into and out the cell in our city the cell membrane would be like a large fence surrounding the city that only allow certain molecules to go in and out