The making of proteins requires energy. To get this energy, two organelles: mitochondria
and chloroplasts are used.
Chloroplasts are organelles that take light energy and convert it into chemical
energy. A chloroplast has a double membrane, the inner and outer membranes. The inner thylakoid membrane traps
the light energy. Inside the inner membrane are stacks of grana, and surrounding the grana is a fluid known as
stroma. Chloroplasts, which are contained in chlorophyll, contain the green pigment chlorophyll, which traps light energy
and make leaves and stems green. The chemical energy that is captured by the chloroplasts is stored in sugar molecules
until they are broke down.