Astrand of dna in a skin cell contains the bases:
a-t-g-c-c-a-t-c-g-g-t-a
after the cell is exposed to ultraviolet light, the strand contains the bases:
a-t-g-g-c-c-a-t-c-g-g-t-a
which statement describes the result of this exposure?
(1)a new base has been inserted.
(2)a base has been deleted.
(3)one base has been substituted for another.
(4)there have been no changes in the bases.

Why can cancer in the lymph nodes (lymphoma) be particularly dangerous? a. the lymph node's ability to produce cancer-fighting lymphocytes would be compromised. b. the lymph node's ability to produce cancer-fighting lymph would be compromised. c. the lymph nodes produce lymph, which nourishes growing cancer cells. d. the lymph nodes produce chyle, which nourishes growing cancer cells.