The thylakoid membrane contains chlorophyll, the photosynthetic pigment and other darker pigments as well. They are arranged in a pattern of dark and light bands. These rays capture light for two photosystems called photosystem one and photosystem two, which are used in an electron transport process.
The electron transport process produces ATP, which is used in the Calvin cycle to fix carbon gained from CO2 and make sugars. The membrane also contains acidic lipids and galactolipids. The membrane itself is made up of lipids, which are richest in linolenic acid. These lipids that make up the membrane are synthesized in a process that involves the exchange of lipid precursors between the endoplasmic reticulum and inner membrane.