Sub-cells are usually defined to better measure the sediment budget of a coast with varying rates of accretion and erosion. The landward boundary of a littoral cell is usually the foot of a dune or cliff, however, the seaward boundary is difficult to define as mechanisms of sediment transport here are poorly understood.ediment sinks can include longshore drift of sediment away from an area and sediment deposition into an estuary. Anthropogenic activities can also influence sedimentary budgets; in particular damming of a river and in stream gravel mining of a river bed can reduce the sediment source to the coast.
To pinpoint at what step during the biogenesis of a secretory protein this mRNA reduction occurs, the authors utilized small interfering RNA (siRNA)-mediated depletion of SRP, the SRP receptor subunits, or the translocon.
Rating Newest Oldest. Best Answer: RNA polymerase (RNAP or RNApol) is an enzyme that produces RNA. In cells, RNAP is needed for constructing RNA chains from DNA genes as templates, a process called transcription. RNA polymerase enzymes are essential to life and are found in all organisms and many viruses. In chemical terms, RNAP is a nucleotidyl transferase that polymerizes ribonucleotides at the 3' end of an RNA transcript.