50. The Nobel Prize in Physiology or Medicine 2009 was awarded jointly to Blackburn, Greider and Szostak for the discovery that chromosomes are protected by telomeres and the enzyme telomerase is highly correlated with aging and cancer in animals. Which of the following statements regarding telomere and telomerase is correct?
(A) Telomerase is a DNA exonuclease.
(B) Telomerase is an RNA polymerase.
(C) Embryonic cells possess long telomeres and high telomerase activity.
(D) Telomeres are longer and telomerase is inactive in cancer cells.
(E) Telomeres are longer and telomerase is highly active in somatic cells.
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