6. Three different RNA polymerases are involved in eukaryotic gene transcription
ID: 207346 • Letter: 6
Question
6. Three different RNA polymerases are involved in eukaryotic gene transcriptions assign eadh polymerase to the type of RNA it transcribes. Name at least three noncoding RNAs that are transcribed, and what are the functions of the ncRNAs in the cel? 7. Draw and label a hypothetical eukaryotic gene showing the regulatory, st regions. Indicate the splice sequences to a ready to use mature mRNA that can be translated. structural and termination between the introns and exons. Process the transcription product 8. What is a codon and what are the properties of the genetic code?Explanation / Answer
Q8) A base triplet on mRNA chain is called a codon. The properties of genetic code are as follows:
- Triplet nature: The genetic code is a triplet code. Three adjacent bases termed as codon, specify one amino acid,. The frist, second and third bases represent 5' to3' direction.
- Universality: The genetic code is universal i.e, a given codon in DNA and mRNA specifies the same amini acid in the protein- synthesizing systems from bacteria to man also in viruses.
- No Punctuation: The genetic code is commaless. There are no punctuation marks between the coding triplets.
- The genetic code is degenerate.
- Nonambiguity of Codons: Each codon codes for only one amino acid, none for more than one. No dout the codons, GAA and GAG both specify glutamic acid, neither of them specifies any other amino acid.
- Initiation or Start Codon; The codon AUG is called the initiation or start codon because it begins the synthesis of polypeptide chain. It also codes for amino acid methionine etc.
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