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 and RNA are strands of nucleotides. DNA is a double-stranded  nucleotide, and RNA is a single-stranded nucleotide.    Both DNA and RNA are known as nucleic acids.â¦ DNA in most cases has  control on the genetic information of the cell where as RNA is  produced by DNA strands to perform specific functions.here are many types of RNA including mRNA, tRNA, and rRNA. mRNA and tRNA are involved in protein synthesis and the process of â¦ translation. mRNA and tRNA bind to the ribosome and form polypeptides or proteins that are released into the cell.