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.
Concept 21 RNA is an intermediary between DNA and protein. DNA is found mostly in the cell nucleus, but another type of nucleic acid, RNA, is common in the cytoplasm. Watson and Crick proposed that RNA must copy the DNA message in the nucleus and carry it out to the cytoplasm, where proteins are synthesized. Crick also predicted the existence of an adaptor molecule that reads the genetic code and selects the appropriate amino acids to add to a growing polypeptide chain.
It carries this information from DNA, which is housed inside the cell nucleus, to the ribosomes. These can be found in the cytoplasm and are the 'factories' which make the proteins. Inside the nucleus RNA transcribes the genetic information by producing a complimentary nucleic acid strand-a copy of a DNA sequence.here RNA is Found. Cell Nucleus. Here RNA comes into existence as the newly created messenger RNA (mRNA) molecules known as primary transcripts or pre-mRNA. It undergoes some modification before being transported out into the cytoplasm.