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.
DNA is double stranded, so 2. RNA is single stranded, so 1. DNA is located in the nucleus. RNA is located in a few places because there are different types of RNA....RNA is copied in the nucleus (mRNA), and then shipped out to a ribosome (which has rRNA and tRNA), floating in the cytoplasm. DNA has 2 strands, RNA just 1, and they both can be found in the nucleus of the cell.