Which of the following is not associated with mRNA processing in eukaryotes? add
ID: 181884 • Letter: W
Question
Which of the following is not associated with mRNA processing in eukaryotes? addition of a 5' methyl guanosine cap 3 polyadenylation removal of introns removal of exons in eukaryotes, tRNAs are transcribed in the nudes and function in the nucleus. transcribed in the nucleus but function in the cytoplasm. transcribed in the cytoplasm and function m the cytoplasm. transcribed in both the nudes and the cytoplasm and function in the cytoplasm. transcribed in the cytoplasm and function in the nudes. A change in a nude tide sequence that results in addition or deletion of a single nucleotide and largely changes the amino acid sequence of the resulting peptide is known of a nonsense mutation. silent mutation. missense mutation. frameshift mutation. none of the above in eukaryotes. Which RNA polymerase transcribes the genes that encode proteins? RNA polymerase I RNA polymerase II RNA polymerase III RNA polymerase IV RNA polymerase V RNA polymerase recognizes which of the following DNA regions in transition? promoter operator attenuator leader structural gene Acceding to the central dogma, the process that mediates the conversion of RNA to protein is transduction translation transcription transition If the following is NOT required for transcription? Ribonucleotides RNA primers DNA template RNA polymerase PromoterExplanation / Answer
Answer:
1. D. Removal of exons
Exons are protein coding codons, they are not to be removed.
2). B. transcribed in the nucleus but function in the cytoplasm
The tRNAs are transcribed and processed in the nucleus and then released into the cytoplasm where they are linked to free amino acids for protein synthesis.
3). D. frameshift mutation
Frameshift mutation is a mutation caused by the addition or deletion of a base pair or base pairs in the DNA of a gene resulting in the translation of the genetic code in an unnatural reading frame from the position of the mutation to the end of the gene.
4). RNA polymerase II
Eukaryotic cells contain three distinct nuclear RNA polymerases that transcribe different classes of genes. Protein-coding genes are transcribed by RNA polymerase II to yield mRNAs; ribosomal RNAs (rRNAs) and transfer RNAs (tRNAs) are transcribed by RNA polymerases I and III.
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