â¢ Medium-grained (1/16 mm to 2 mm) rocks are usually called sandstone. Medium-grained rocks can be composed of quartz grains, feldspar grains (arkose), or rock fragments and clay (graywacke). Sandstone (Photograph by Parvinder Sethi). Medium-sized grains in clastic sedimentary rocks form sandstone. This sample is a quartz sandstone.
Eukaryotes are those organisms in which the cell body contains a nucleus whereas prokaryotes are those organisms in which the cell body does not contain a nucleus. In amoeba, the reproduction is carried out under the instruction of the nucleus thus making it a eukaryote organism.
â¢ In eukaryotes, multiple replication sites are present in a single DNA molecule whereas, in prokaryotes, a single replication site is present in the circular DNA molecule. â¢ In prokaryotes, DNA replication involves three polymerase enzymes; namely, DNA polymerase I, DNA polymerase II, and DNA polymerase III.rokaryotic DNA and eukaryotic DNA vary widely; so do their replication processes. Prokaryotic DNA Replication. Unlike in eukaryotes, there is a single circular DNA exists in prokaryotes. The replication in the prokaryotic chromosome begins at the origin of replication.