Which of the following is NOT true about introns? They do not have any complemen

Question

Which of the following is NOT true about introns? They do not have any complementary bases in DNA In some cases an intron may be spliced out in one form of the mRNA, but remain in the mRNA in other instances Some can splice themselves out of the pre-mRNA They are found in most eukaryotic genes, but not in bacterial genes Some are spliced out of the pre-mRNA by snRNPs Which type of intron is self-splicing? I II III IV No type of intron is self-splicing. All must have protein enzymes to do this The lariat structure in some introns is held together by a phosphodiester bridge between the 5' carbon atom at one end and the carbon atom of one nucleotide in the RNA chain. 1' 2' 3' 4' 5' An advantage of exon shuffling during recombination might be to Eliminate introns Allow rapid protein evolution Guarantee precise recombination Eliminate polyA tails Eliminate the need for a 5' methylguanosine cap In normal cells a gene may code for more than one protein by Using different tRNAs for the same codon Having alternative splicing of introns

Explanation / Answer

17) Introns is also a part of DNA and do contain its complementary bases. So, the answer is (A).

18) Group, I &II introns are self-splicing intron or refers to self-splicing ribozymes. However, group II introns are excised in the same way as nuclear pre-mRNA introns. hence, the answer is (A).

19) The lariat structure includes 2'-5' linkage joining the 5'end of the intron with an adenosine residue, the branch point, near the 3' end of the intron.

20) Exon shuffling during recombination might be to allow protein evolution. Hence, the answer is (B).

21) In normal cells, a gene may code for more than one protein by- having alternative splicing of introns

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