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exercism fetch ruby protein-translation

Protein Translation

Translate RNA sequences into proteins.

RNA can be broken into three nucleotide sequences called codons, and then translated to a polypeptide like so:

RNA: "AUGUUUUCU" => translates to

Codons: "AUG", "UUU", "UCU" => which become a polypeptide with the following sequence =>

Protein: "Methionine", "Phenylalanine", "Serine"

There are 64 codons which in turn correspond to 20 amino acids; however, all of the codon sequences and resulting amino acids are not important in this exercise. If it works for one codon, the program should work for all of them. However, feel free to expand the list in the test suite to include them all.

There are also four terminating codons (also known as 'STOP' codons); if any of these codons are encountered (by the ribosome), all translation ends and the protein is terminated.

All subsequent codons after are ignored, like this:

RNA: "AUGUUUUCUUAAAUG" =>

Codons: "AUG", "UUU", "UCU", "UAG", "AUG" =>

Protein: "Methionine", "Phenylalanine", "Serine"

Note the stop codon terminates the translation and the final methionine is not translated into the protein sequence.

Below are the codons and resulting Amino Acids needed for the exercise.

Codon Protein
AUG Methionine
UUU, UUC Phenylalanine
UUA, UUG Leucine
UCU, UCC, UCA, UCG Serine
UAU, UAC Tyrosine
UGU, UGC Cysteine
UGG Tryptophan
UAA, UAG, UGA STOP

Learn more about protein translation on Wikipedia


For installation and learning resources, refer to the exercism help page.

For running the tests provided, you will need the Minitest gem. Open a terminal window and run the following command to install minitest:

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gem install minitest

If you would like color output, you can require 'minitest/pride' in the test file, or note the alternative instruction, below, for running the test file.

In order to run the test, you can run the test file from the exercise directory. For example, if the test suite is called hello_world_test.rb, you can run the following command:

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ruby hello_world_test.rb

To include color from the command line:

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ruby -r minitest/pride hello_world_test.rb

Source

Tyler Long

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.