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.
Chloroplast DNA. Like mitochondria, chloroplast also contain circular double stranded DNA molecules. They too do not associate with histones. Chloroplast genome contain two inverted repeats called IRA and IRB, therefore many genes encoded by chloroplast genome have two copies.oth mitochodnria and chloroplasts have their own genetic material, which are circular double stranded DNA. They exist in nucleoid regions within the organelles, usually multiple copies, encode rRNA and some proteins for the organelle function.