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UAA, UAG and UGA are known as non - sens...

UAA, UAG and UGA are known as non - sense codons because they

A

code for amino acids, which are not essential amino acids

B

code for the initiator amino acid (menthionine), which is later removed from the polypeptide chain

C

are never present on mRNA

D

do not code for any amino acid

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The correct Answer is:
D
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In mRNA , AUG is the initiating codons and UAA, UAG and UGA are terminatinng codona . Therefore, the polypeptide cannot be synthesised beyond any of these triplets to the end of mRNA, then which one of the following mRNA can be translated completely?

Following are not features of genetic codes. What does each one indicate? Stop codon, Unambiguous codon, Degenerate codon, Universal codon. Stop codon : It includes UAA, UAG and UGA. These codons signal end of protain synthesis.

ARIHANT NEET-GENE, ITS EXPRESSION AND REGULATION-Chapter Exercise (A) Taking it together (Assorted questions of the Chapter for Advanced Level Practice
  1. The gene, which producers mRNA has specific start and stop signals, wh...

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  2. RNA polymerase

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  3. UAA, UAG and UGA are known as non - sense codons because they

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  4. Genetic material is

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  5. Transfer RNA

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  6. Translocation involves

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  7. Changes in a polypeptide after translation may involve the

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  8. Several proteins may be produced at the same time

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  9. A ribozyme is an

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  10. Inducible enzyme are

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  11. The control of gene expression is more complex in eukaryotic cells bec...

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  12. What are proteosomes

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  13. Regulatory proteins are the accessory proteins that interact with RNA ...

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  14. The first undoubted evidence about DNA being the genetic material came...

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  15. Dr. Khorana and his colleagues synthesized an RNA molecule with repeat...

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  16. The promoter site and the terminator site for transcription are locate...

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  17. The wild type E. coli cells are growing in normal medium with glucose....

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  18. In an E coli cell according to the operon theory, an operator gene com...

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  19. The lac operon requires a ' helper' protein which, by binding to the p...

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  20. Which one of the following pairs is correctly matched?

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