Cancer can occur when DNA is damaged. Which of the following statements about the cause of damage to DNA molecules is true?

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Excision repair enzymes are able to prevent all mutations in DNA.

  

DNA molecules can break down in the absence of environmental toxins or radiation.

  

Only environmental toxins such as cigarette smoke, aflatoxins, and other toxins in food can damage the structure of DNA.

  

Small quantities of ultraviolet radiation have no effect on DNA structure.

 

asked Dec 27, 2012 in Biology by anonymous
    

1 Answer

0 votes

 

DNA molecules can break down in the absence of environmental toxins or radiation.

 

answered Dec 27, 2012 by anonymous



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