A codon will be flashed on the screen. Think about the amino acid coded by that codon and then click "Show Answer" button to verify the correct answer. Click "Next Question" button to go to the next question (another codon). Repeat the same. If want to learn before taking the test, click "ordered" and then "reset" to see the codons in sequence. To see questions in shuffled order, select "Random". (Total number of questions and the present question No. are displayed at the right hand top corner.)
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