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    Learn English > English lessons and exercises > English test #86754: All about DNA
    > Other English exercises on the same topic: Diseases [Change theme]
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    All about DNA

    Complete the sentences.

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    English exercise "All about DNA" created by val92 with The test builder. [More lessons & exercises from val92]
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    1. DNA (which stands for ) is one of the most important elements in living cells.

    2. DNA can be compared to the programming code in a computer. Indeed, DNA contains all the information necessary for

    3. DNA is composed of two large which interact with each other.

    4. The DNA shape is special and looks like a .

    5. That special structure was identified by two English-speaking in 1953.

    6. They received a for that scientific discovery in 1962.

    7. Each strand of the helix is composed of a series of small molecules called
    which are linked to one another. There are four different nucleotides: adenine, guanine, cytosine and thymine.

    8. The sequence of nucleotides is very important and defines the .

    9. Each living has its own genome which encodes different proteins.

    10. The is used to translate the DNA sequence into a protein sequence.

    11. Proteins are composed of small blocks called
    . The length of the proteins varies from 50 to 25000 amino acids.

    12. Proteins are used by organisms to structure cells, to form different cellular
    such as liver, lung or brain. But proteins also play a crucial role in regulating cell functions.

    13. Each cell is regulated differently, so is more expressed in blood cells than in neuron for example.

    14. A single in the DNA induces a modification of the protein.

    15. That modification can be responsible for
    . The appearance of those diseases can be prevented by adopting a healthy lifestyle.

    End of the free exercise to learn English: All about DNA
    A free English exercise to learn English.
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