The predominant cells in blood are the red blood cells (RBC) which contains a protein called hemoglobin. Hemoglobin is the principal determinant of the color of blood. Arterial blood and capillary blood are bright red, as oxygen imparts a strong red color to the heme group.
RNA is assembled as a chain of nucleotides, that is usually  single-stranded. In eukaryotic cells, it can be found in the  nucleus and cytoplasm. Edit. Share to: Lsilvstew. 2,538 Contributions. Answered Most Recently. In Genetics.
However, unlike DNA, RNA is not restricted to the nucleus. It can migrate out into other parts of the cell. Some RNA, called messenger RNA (mRNA) communicate the genetic message found in the DNA out to the rest of the cell for the purpose of promoting the synthesis of proteins. How a gene sequence in DNA is ultimately translated into its corresponding protein is discussed in the Protein synthesis section.