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.
Decay. E. coli bacteria (Photo from Rocky Mountain Laboratories, NIAID, NIH). Decay is essential to our survival â it helps to digest food, and to recycle materials in our environment. Sometimes it can cause problems too, such as food spoilage (food going off).The main groups of decomposer organisms are bacteria and fungi.Bacteria are single-celled microscopic organisms. Fungi are often larger organisms that include moulds and mushrooms. They both cause decay by releasing enzymes which break down compounds in their food so it can be absorbed by their cells.ometimes it can cause problems too, such as food spoilage (food going off). The main groups of decomposer organisms are bacteria and fungi. Bacteria are single-celled microscopic organisms. Fungi are often larger organisms that include moulds and mushrooms.