The glial cells outnumber theneurones and the two cell types occupy a comparable amount of space in nervous tissue. The main glial cell types are, inthe central nervous system, astrocytes and oligodendrocytes and, in the peripheral nervous system, Schwann cells, entericglial cells and satellite cells.he glial cells outnumber theneurones and the two cell types occupy a comparable amount of space in nervous tissue. The main glial cell types are, inthe central nervous system, astrocytes and oligodendrocytes and, in the peripheral nervous system, Schwann cells, entericglial cells and satellite cells.
1 Cytosine is found in both DNA and RNA, but thymine is only found in DNA and uracil is only found in RNA.  A nucleotide is formed when a phosphate attahes to the 5' carbon of the sugar and one of the nitrogenous baseses attaches to the 1' carbon of the sugar.
(1) RNA is single-stranded while DNA is a double-stranded helix. (2) RNA also has uracil as its base while the DNA base is thymine. However, even with the differences in their structures, DNA and RNA have cooperating roles in the field of Cell Biology. DNA contains a pentose sugar Deoxyribose, RNA contains the pentose sugar Ribose. A pentose is a 5-carbon sugar molecule. - DNA is limited to the nucleus, RNA is made in the nucleus, but can travel outside of it.