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What is an intervening sequence of DNA that is not expressed called?
An intervening sequence of DNA that is not expressed is called an intron. Intron sequences are removed during RNA processing, while the remaining expressed sequences are known as exons.
Which section of the pre-mRNA contains the protein coding regions?
intron
Describe a recombinant DNA experiment in two or three sentences use the following terms intron?
Intron is a DNA sequence which has no meaningful codes, but in other hand exons codes for the meaningful proteins. So those exons are collectively made as mRNA, from that cDNA would be synthesized to clone them in rDNA technology.
Does intron removal take place in the nucleus?
Yes, intron removal takes place in the nucleus. In eukaryotic cells, the process of RNA splicing, which involves the removal of introns from pre-mRNA, occurs in the nucleus before the transcript is transported to the cytoplasm for translation.
Are promoter a part of an intron?
Promoters are not part of an intron. Promoters are specific DNA sequences located upstream of a gene, which are responsible for initiating the transcription process. In contrast, introns are non-coding sequences found within a gene that are removed during RNA processing before the mature mRNA is translated into a protein.
What terms is least closely related to the terms intron tRNA polypeptide and anticodon?
intron
What is an intervening sequence of DNA that is not expressed called?
An intervening sequence of DNA that is not expressed is called an intron. Intron sequences are removed during RNA processing, while the remaining expressed sequences are known as exons.
What terms are most closely relateed?
Both A and B
What is the definition of the word intron?
The definition of the 'intron' is part of the DNA sequence within a gene. It is the sequence within a particular gene that is removed during the RNA splicing process.
Which section of the pre-mRNA contains the protein coding regions?
intron
Describe a recombinant DNA experiment in two or three sentences use the following terms intron?
Intron is a DNA sequence which has no meaningful codes, but in other hand exons codes for the meaningful proteins. So those exons are collectively made as mRNA, from that cDNA would be synthesized to clone them in rDNA technology.
In the definition for Group III intron should the phrase be intron is excised as a lariat?
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What is the one gene-one polypeptide hypothesis?
The one gene-one polypeptide hypothesis is an idea in an attempt to fix the one gene-one protein hypothesis (previously one gene-one enzyme hypothesis) after scientists realized that proteins can be made up by more than one polypeptide chain and that each polypeptide chain is specified by its own gene. An example would be a protein like hemoglobin, the oxygen transporting protein of vertebrate blood cells. Hemoglobin is made up of two kinds of polypeptides. Because of the two polypeptide chains, hemoglobin is made up of two genes. While this hypothesis was an improvement, it wasn't entirely true. While the example is true, the fact of the matter is, eukaryotes are much more complex than 1940s (around the time that Tatum and Beadle first came up with the one gene-one enzyme hypothesis ) technology allowed for scientists to understand. There is a step in RNA processing or post-transcriptional modification where parts of the transcribed gene is cut out (the cut out part is called the intron). Because of this mechanism, it is possible for a single gene to create more than 1 polypeptide.
Are both intron and exon regions are transcribed into the primary transcript?
Yes, both intron and exon regions are transcribed into the primary transcript during transcription. However, only the exons are retained in the processed mRNA after introns are removed through the process of splicing.
Does intron removal take place in the nucleus?
Yes, intron removal takes place in the nucleus. In eukaryotic cells, the process of RNA splicing, which involves the removal of introns from pre-mRNA, occurs in the nucleus before the transcript is transported to the cytoplasm for translation.
Why do eukaryotic organisms transcribe intron regions when making mRNA molecules?
Eukaryotic organisms transcribe intron regions when making mRNA molecules because they contain important regulatory sequences that help in the processing and splicing of the mRNA to produce a functional and mature mRNA molecule for protein synthesis.
What is the average size of an intron?
According to Hong et al (2006), the average size of an intron is 3479 base pairs. However, the average is skewed by some very large introns. A better picture comes from the median size, which is 1334 base pairs. Reference: Hong X, Scofield DG, Lynch M (2006) Intron size, abundance, and distribution within untranslated regions of genes. Mol. Biol. Evol. 23:2392-404
