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.
Chloroplasts have their own DNA, often abbreviated as ctDNA, or cpDNA. It is also known as the plastome when referring to genomes of other plastids. Its existence was first proved in 1962, and first sequenced in 1986âwhen two Japanese research teams sequenced the chloroplast DNA of liverwort and tobacco.hloroplasts have their own DNA, often abbreviated as ctDNA, or cpDNA. It is also known as the plastome when referring to genomes of other plastids. Its existence was first proved in 1962, and first sequenced in 1986âwhen two Japanese research teams sequenced the chloroplast DNA of liverwort and tobacco.