Question at position 10 When RNA splicing occurs:ribosomes are split in halfintrons are removed from mRNAit means that a poly-adenine tail has been added50s and 30s ribosomal subunits are joined togetherDNA ligase is required单项选择题

A

ribosomes are split in half

B

introns are removed from mRNA

C

it means that a poly-adenine tail has been added

D

50s and 30s ribosomal subunits are joined together

E

DNA ligase is required

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类似问题

Figure 1 illustrates a process that occurs in a certain group of organisms. The Spliceosome is represented by a circle. A line begins to the left of the circle and that section of line is labeled Exon 1. The line moves into the circle, dips down below the circle, then curves back up into the circle, leaves the circle from the right side and at that point that section of line outside the circle is labeled Exon 2. An arrow points upward and to the right from the right end of the line to Spliced Exons that represent the combined 2 ends of the lines outside of the circle labeled Exon 1 and Exon 2. Moving back to the circle, an arrow points downward and to the right from the circle to the Removed Intron and that line represents the rest of the line that had started inside the circle and then dipped down below the circle and then curved back up into the circle. Figure 1. Model of spliceosome activity Which of the following best predicts the importance of this process?

A gene encodes a pre-mRNA with 5 exons and 4 introns.  A mutation eliminates the 3’ splice site from intron 3. What exons would be found in the mRNA after splicing was completed?

In eukaryotes, what does the mRNA transcript contain? 

In eukaryotic cells, the initial RNA transcript (pre-mRNA) contains non-coding segments called [ Select ] spliceosomes promoters exons introns polymerase that intervene between coding regions. Before the RNA leaves the nucleus, a large protein-RNA complex called the [ Select ] introns polymerase exons ribosomes spliceosomes removes these non-coding parts and joins the coding regions, known as [ Select ] promoters spliceosomes polymerase exons introns together. This process allows a single gene to encode multiple different proteins depending on which segments are treated as coding.

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