Articles - 'a', 'an' and 'the'


  • Choose the missing articles (a, an or the) in the spaces.
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.

   a      a      a      A      a      the      The      the      The      The      the      the      the      the      The      the      the      the      The      the  
Scientists in Israel say they have conducted tests to successfully stop and reverse biological ageing process. tests were part of joint project by Tel Aviv University and Shamir Medical Center. The researchers said the science behind their experiments was very simple - they used only oxygen to slow down and turn around what happens to cells as they age. They used high-pressure oxygen on cells that were in pressure chamber. scientists said two processes related to ageing and illnesses slowed down. scientists did tests on 35 adults over age of 64 for 90 minutes day, five times a week for three months. Their study was published in magazine "Ageing" on November the 18th.

lead scientist explained how important his team's research was. Professor Shai Efrati says study shows that the ageing process can be reversed at cellular level. He says we may be able to stop telomeres from shortening. Telomeres are inside cells. shorter they become, more we age. If we can stop them getting shorter, cells will not age. Professor Efrati said: "Today telomere shortening is considered 'Holy Grail' of the biology of ageing. Researchers around world are trying to develop [drugs] that enable telomere lengthening." He added: " study gives hope, and opens door for a lot of young scientists to target ageing as reversible disease."

Back to the ageing lesson.

Share this lesson

More Free Sites by Sean Banville

Online Activities