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.
Answer Wiki. -The RNA primers in prokaryotes are actually much longer than those in eukaryotes. -There are some additional proteins with little understood function that are present during eukaryotic replication. -Prokaryotes initiate replication through the binding of the DnaA protein to specific sequences at the origin. This then triggers the melting of a downstream AT rich region through ATPase activity.