Until recently, little was known about the mag-. nitudes of the various nonpoint and point sources of. nitrogen. This knowledge gap has made it difficult to. develop a national strategy for nonpoint-source pollu-. tion prevention and control. Many of the water-pollution-control measures.
Even though the ribosomes are usually considered accurate and processive machines, the translation process is subject to errors that can lead either to the synthesis of erroneous proteins or to the premature abandonment of translation.
Post-transcriptional modifications OF RNA accomplish two things: 1) Modifications help the RNA molecule to be recognized by molecules that mediate RNA translation into proteins; 2) During post-transcriptional processing, portions of the RNA chain that are not supposed to be translated into proteins are cut out of the sequence.