LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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exon is coding sequence
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to start initiation
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to start the transcription
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to terminate the transcription
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Detailed explanation-1: -Exons are coding sections of an RNA transcript, or the DNA encoding it, that are translated into protein. Exons can be separated by intervening sections of DNA that do not code for proteins, known as introns.
Detailed explanation-2: -The introns are not decoded as proteins; rather, these regions are spliced before the initiation of translation. Thus, both exons and introns are not used in translating proteins. Instead, only exons are used for the translation process.
Detailed explanation-3: -Why do non-coding exons exist? Non-coding exons can contain some regulatory elements that modulate the protein expression, such as enhancers, silencer, or small non-coding RNA.
Detailed explanation-4: -the coding sequence doesn’t start at the first exon. The coding sequence is the sequence that actually codes for the protein. mRNA is composed of exons and introns, which is later edited as the mRNA is exported out of the nucleus. Editing is conducted by the splicesomem removing intron, producing mature mRNA.
Detailed explanation-5: -Exons are the parts of a gene that code for proteins. They are transcribed and translated to make a final product.