Answer:
Splicing needs to be precise and consistent. It involves careful cutting and pasting specific parts of the pre-mRNA (introns ans exons).
Introns are recognized are recognized and removed by the spliceosome, an enzyme complex made of protein and small RNAs.
Introns have a GU (guanine, uracil) nucleotide sequence at the 5´end splice site, and an AG (adenine, guanine) at the 3´end splice site. The 3´ site can also have a polypyrimidine tract (RPT) which recruits factors to the 3´splice site and the first adenosine required for the first step of splicing.
These are the borders recognized by the spliceosome which executes a two step transesterification reactions between RNA nucleotides.
After the first cutting step, the 3´ end of the released 5´exon is joined to the next one releasing the intron.
During translation, the mRNA sequence is read in groups of three nucleotides, thats why the RNA splicing has to occur precisely at the exon-intron borders as described in order to avoid resetting the open reading frame.
Answer:
A. The catalytic activity of the complex is enhanced by the protein component and completely dependent on the RNA component of the complex.
Explanation:
RNAses are enzymes that degrade RNA. When treating the complex with an RNAse, the catalytic activity is completely abolished. This tells us that the RNA component is indispensable to the catalytic activity of the complex.
Proteases are enzymes that degrade proteins. Treating the complex with proteases only decreases slightly the catalytic activity, but it does not abolish it completely. This tells us that the protein component of the complex enhances the catalytic activity, but without it the complex can still work.
Answer:
A. The light waves squeeze together increasing wavelength
Explanation:
ANSWER: the comparison of data all over the world can be done quickly
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