An organism which obtains its energy from the oxidation of organic compounds. The green pigment required for photosynthesis . It consists of a light-sensitive tetrapyrrole ring with a magnesium atom in the center. A cigar-shaped structure bounded by a nonunit membrane and containing the light harvesting bacteriochlorophyll in green sulfur bacteria and in Chloroflexus . A type of sterols occurring widely in animal tissues as well as in some higher plants and algae .
Cholesterol is notorious yet important.
These phases can be solid, liquid, or gaseous, according to the type of chromatography. Due to the different adsorption or affinity to either phase, molecules of different species may be separated. A genetic element carrying genes essential to cellular metabolism. Prokayrotes typically have a single chromosome, consisting of a circular DNA molecule. Eukaryotic cells contain several chromosomes, each contaiing a linear DNA molecule complexed with specific proteins .