test 1 Listen to the audio file in order to fill in the gaps in the text provided.
test 2
Match the words on
the left with their synonyms on the right. These
words are important becausethey will help you to understand other texts about DNA and genetics.
test 3 Complete the crossword with key words taken from
the text about DNA and whose definitions are given.
test 4 Answer the quiz. Only one of the three answers is correct.