Genes for histones seem to have no introns.
Genes for histones seem to have no introns.
Introns are found in a few bacterial and archaeal genes.
Introns are found in a few bacterial and archaeal genes.
Although spliceosomal introns seem to be limited to eukaryotes, the other three intron classes are not. Genes with group I and II introns have now been found in both bacteria and bacterial viruses.
Although spliceosomal introns seem to be limited to eukaryotes, the other three intron classes are not. Genes with group I and II introns have now been found in both bacteria and bacterial viruses.
Coding sequence of microRNAs may be present in the introns of split gene, and it can also exist in the intergenic non-coding regions. A: 正确 B: 错误
Coding sequence of microRNAs may be present in the introns of split gene, and it can also exist in the intergenic non-coding regions. A: 正确 B: 错误
Which of the following statements about a protein-coding gene is NOT true? A: An enhancer is not a DNA sequence. B: It may have many exons and introns. C: The promoter region is not transcribed. D: Transcription factors can bind to the promoter region.
Which of the following statements about a protein-coding gene is NOT true? A: An enhancer is not a DNA sequence. B: It may have many exons and introns. C: The promoter region is not transcribed. D: Transcription factors can bind to the promoter region.
Group I introns are remarkable because: A: They are spliced by external RNA molecules without protein involvement. B: They are spliced by protein molecules in the absence of external RNA molecules. C: They are autocatalytic. D: They are only present in mitochondrial and chloroplast genomes.
Group I introns are remarkable because: A: They are spliced by external RNA molecules without protein involvement. B: They are spliced by protein molecules in the absence of external RNA molecules. C: They are autocatalytic. D: They are only present in mitochondrial and chloroplast genomes.