Oxygen-Carrying Protein in the Blood: Hemoglobin. Hemoglobin is the protein that transports oxygen (O 2) in human blood from the lungs to the tissues of the body. Proteins are formed by the linking of amino acids into polypeptide chains.n hemoglobin, each subunit contains a heme group, which is displayed using the ball-and-stick representation in Figure 2. Each heme group contains an iron atom that is able to bind to one oxygen (O 2) molecule.
Decomposer: is an organism, usually a bacterium or fungus, that breaks down the cells of dead plants and animals into simpler substances. A fungus, such as this mushroom, is a decomposer of dead plants.
Bacteria and other microbes play the important role in environment of DECOMPOSERS, which act in the last stage of food chain. These microorganisms like bacteria cause the brea â¦ kdown of energy rich organic compounds.xample: Nitrobacter. 3. Bacteria that denitrifies nitrates (NO3-) in the soil (called denitrifying bacteria). Example: Pseudomonas denitrificans. 4. Bacteria that fixes nitrogen (called nitrogen-fixing bacteria). Examples: Rhizobium (which is symbiotic) and Azotobacter (which is free-living). 5.