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.
Click Here to return to the search form. If I'm remembering correctly, chloroplasts have their own DNA, too. Scientists believe that mitochondria and chloroplasts were primitive cells without nuclei (prokaryotes) that got inside of primitive cells with nuclei (eukaryotes) and then stayed there.o they came in with their own DNA, and now they still have some of their own DNA that carries the code for some of their own proteins. They also need some proteins coded by genes in the nuclear DNA. A woman scientist first suggested all this, Lynn Margulis.