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Genetic Code and Regulation

Genetic Code and Regulation
How many different codons are possible?

20
3
64
An infinite number

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Genetic Code and Regulation
In protein synthesis in prokaryotes

the initiating amino acid is phenyl alanine
the initiating amino acid is N- formyl methionine
None of these
the initiating amino acid is methionine

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Genetic Code and Regulation
Which of the following techniques was carried out by Nirenberg and Matthaei in 1961 to determine the first codon?

In vitro synthesis of a polypeptide using UUUUU
Mixed co-polymer mRNA synthesis
Labeled peptide binding to a ribosome
None of these

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Genetic Code and Regulation
AUG codes for methionine act as a

termination code
propagation code
elongation code
initiation code

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Genetic Code and Regulation
The codons which do not specify an amino acid are called

termination code
propagation code
none of these
initiation code

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Genetic Code and Regulation
Crick demonstrated that the genetic code involved three bases and suggested that the code was degenerated. What experimental technique Crick conducted to suggest genetic code degeneration?

Gel electrophoresis
Restriction digests of the rII gene
Frameshift mutagenesis
Density gradient centrifugation

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