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Genetic Code and Regulation

Genetic Code and Regulation
Codon that specify the amino acids often differs in the

second base
none of these
first base
third base

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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?

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

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Genetic Code and Regulation
In prokaryotes, AUG encodes

alanine
methionine
N-formyl methionine
a stop codon

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Genetic Code and Regulation
AUG codes for methionine act as a

propagation code
termination code
elongation code
initiation code

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Genetic Code and Regulation
Which of the following has been used as an evidence that primitive life forms lacked both DNA and enzymes?

All of these
RNA can both code genetic information and act as a catalyst
DNA and enzymes are only present in the most advanced cells
Advanced cells lack RNA

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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
Density gradient centrifugation
Frameshift mutagenesis

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