1 The measure of a complete circle, in radians, is 2Ï. 2  A radian is defined as the ratio of the arc length, ââsââ to the length of the radius âârââ. 3  One radian is equal to a little less than 57.3 degrees.
A thylakoid is a membrane-bound compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen.Chloroplast thylakoids frequently form stacks of disks referred to as grana (singular: granum).n higher plants thylakoids are organized into a granum-stroma membrane assembly. A granum (plural grana) is a stack of thylakoid discs. Chloroplasts can have from 10 to 100 grana.
A: Chloroplasts are the organelles other than the nucleus and mitochondria that contain their own DNA. Chloroplasts are found in plants and certain forms of protists. Their DNA and ribosomes are located in the stroma. Chloroplasts are the site of photosynthesis in plants and contains the green pigment known as chlorophyll.