Top pic Scale bar = 500 nanometers
botttom pic scale bar = 100 nanometers
I know it is a chloroplast because we isolated the chloroplasts from spinach leaves.
The top pic is the whole mount of a chloroplast taken using the TEM. Dark circular structures can be seen within the chloroplast. bottom pic shows one of these structures from sideways on at higher magnification.
but i don’t know what these structures are called.