histone / histones. Under the microscope in its extended form, chromatin looks like beads on a string. The beads are called nucleosomes. Each nucleosome is made of DNA wrapped around eight histone proteins that function like a spool and are called a histone octamer.he beads are called nucleosomes. Each nucleosome is made of DNA wrapped around eight histone proteins that function like a spool and are called a histone octamer.
Definition. A hemoglobin test measures the amount of hemoglobin in your blood. Hemoglobin is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs. If a hemoglobin test reveals that your hemoglobin level is lower than normal, it means you have a low red blood cell count (anemia). Anemia can have many different causes, including vitamin deficiencies, bleeding and chronic diseases.
Hemoglobin is a molecule that is within a red blood cell. Each red blood cell is about one third hemoglobin by volume.Each red blood cell can carry four hemoglobin molecules. Hemoglobin is responsible for the color of blood. When they put that thing on the tip of your finger at the ER they are measuring the percentage of hemoglobin's that are in red blood cells.ach red blood cell is about one third hemoglobin by volume. Each red blood cell can carry four hemoglobin molecules. Hemoglobin is responsible for the color of blood.