CHROMATOGRAPHY QUIZ

In protein synthesis in prokaryotes

the initiating amino acid is methionine

the initiating amino acid is N- formyl methionine

the initiating amino acid is phenyl alanine

None of these

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The genetic code is degenerated. Which of the following codons represents the principle of degeneracy?

CAU and CAC

UAA and UAC

UUA and UUC

AUG and AUA

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Translation begins

in nucleus

at the start codon

at the replication fork

on the lagging strand

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How many different codons are possible?

20

64

3

An infinite number

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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

Advanced cells lack RNA

DNA and enzymes are only present in the most advanced cells

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Codon that specify the amino acids often differs in the

second base

first base

none of these

third base

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How many amino acids will be encoded by 5' GAU GGU UGA UGU 3' sequence?

Four

One

Three

Two

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The codons which do not specify an amino acid are called

none of these

initiation code

propagation code

termination code

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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?

Density gradient centrifugation

Gel electrophoresis

Frameshift mutagenesis

Restriction digests of the rII gene

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In some organelles in eukaryotes, the genetic code for some codons

are partially same

are same

None of these

differs from that used in prokaryotes

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