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Translation


This quiz is based on the process of translating mRNA (produced in the nucleus) into protein.

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Multiple choice

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1.

How many amino acids are encoded by the following mRNA sequence : UAUCAUCCACUUGGUUGA ?

  5

  7

  6

  4

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2.

A sequence of about 5 to 20 bases seperating one stop codon from the next start codon in a polycistronic prokaryotic mRNA molecule is called :

  a spacer

  a Shine Dalgarno sequence

  a transposon

  a poly-A-tail

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3.

Every polypeptide chain formed in translation starts with the amino acid :

  alanine

  serine

  lysine

  methionine

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4.

Most amino acids are encoded by more than one codon except tryptophan and :

  glycine

  leucine

  lysine

  methionine

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5.

The triplet base sequence of tRNA nucleotides that is complementary to an mRNA codon (for a particular amino acid) is called :

  an anticodon

  a cistron

  a retroposon

  a transposon

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6.

The difference in the products translated from a tricistronic mRNA molecule by the ribosomes of prokaryotes and eukaryotes is that :

  the prokaryotic ribosome translates only one cistron while the eukaryotic ribosome translates all cistrons.

  the eukaryotic ribosome translates only one cistron while the prokaryotic ribosome translates all cistrons.

  the eukaryotic ribosome will produce one polyprotein instead of three smaller proteins.

  None of the above.

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7.

In prokaryotic mRNA, a particular base sequence (AGGAGGU) exists near the AUG start codon. This sequence which is sometimes referred to as the ribosome binding site is known as :

  a Kozak's consensus sequence

  a promoter sequence

  a Shine Dalgarno sequence

  a trailer sequence

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