Time-saving video on the circulatory system. The circulatory system transports nutrients and blood cells to and from cells throughout the body. The circulatory systems includes veins, arteries and capillaries.
Ribosomal RNA (rRNA) is found in the cell's ribosomes, the specialized structures that are the sites of protein synthesis). Transfer RNA (tRNA) found in the cytoplasm which carries amino acids to the ribosomes for incorporation into a protein.
Adenine and guanine are purine bases found in both DNA and RNA. Cytosine is a pyrimidine base found in both DNA and RNA. Thymine and uracil are pyrimidine bases found in only DNA or RNA, respectively.These five nitrogenous bases are all planar molecules, meaning that they are fairly flat and rigid.denine and guanine are purine bases found in both DNA and RNA. Cytosine is a pyrimidine base found in both DNA and RNA. Thymine and uracil are pyrimidine bases found in only DNA or RNA, respectively. These five nitrogenous bases are all planar molecules, meaning that they are fairly flat and rigid.