By Catherine Beyer. The ankh is the most well known symbol to come out of ancient Egypt. In their hieroglyphic system of writing the ankh represents the concept of eternal life, and that is the general meaning of the symbol. Construction of the Image:
The outer layer of the double membrane is much more permeable than the inner layer, which features a number of embedded membrane transport proteins. Enclosed by the chloroplast membrane is the stroma, a semi-fluid material that contains dissolved enzymes and comprises most of the chloroplast's volume. Since, like mitochondria, chloroplasts possess their own genomes (DNA), the stroma contains chloroplast DNA and special ribosomes and RNAs as well.
As the name implies, chloroplast contains photosynthetic pigment called chlorophyll. Because of the presence of this pigment, chloroplasts can utilize light to synthesize ATP and sugars. Thus, the organisms with chloroplasts can produce their own food. Chloroplasts have two membranes, similar to mitochondria. In addition to these membranes, they have closed compartments called grana. Grana are found inside the inner membrane, and each granum is made up of few to several dish shaped structures called thylakoids. The chlorophyll is found on these thylakoids.