All the organelles in a cell work together to help the cell and the whole organism function. Some diseases are caused by the failure of one type of organelle. Read the description below of an example of this type of disease. A mosaic is a picture made up of small colored pieces. Mosaic viruses cause plant leaves to look like mosaic art. A mixture of dark and light green patches appear on the leaves. The light green patches are not able to capture much energy from sunlight. Which organelle is affected by mosaic viruses?