Ran is a major player in the process of nucleocytoplasmic transport via the nuclear pore. Because net Ran movement simply follows a concentration gradient, what maintains the Ran gradient across the nuclear membrane? Options:   the concentration levels of cargo in the nucleus to be exported   GTP concentrations in the nucleus   the correct positioning of the GEF and GAP with respect to the nuclear envelope   the interaction of exportin and importin with their cognate substrates   none of the above

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Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.