GENETIC CODE AND REGULATION QUIZ

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

Labeled peptide binding to a ribosome

Mixed co-polymer mRNA synthesis

In vitro synthesis of a polypeptide using UUUUU

None of these

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

None of these

are same

are partially same

differs from that used in prokaryotes

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In prokaryotes, AUG encodes

a stop codon

N-formyl methionine

methionine

alanine

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Codon that specify the amino acids often differs in the

none of these

second base

first base

third base

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The genetic code is

species-specific

universal

universal except for rare exceptions in mitochondria and some protozoa

kingdom-specific

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

DNA and enzymes are only present in the most advanced cells

RNA can both code genetic information and act as a catalyst

Advanced cells lack RNA

All of these

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Translation begins

at the start codon

at the replication fork

in nucleus

on the lagging strand

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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?

Restriction digests of the rII gene

Density gradient centrifugation

Frameshift mutagenesis

Gel electrophoresis

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

One

Four

Two

Three

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

UUA and UUC

AUG and AUA

UAA and UAC

CAU and CAC

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