Mustard gas removes guanine (G) from DNA. For developing embryos, exposure to mustard gas can cause sérious deformities because

Question

Mustard gas removes guanine (G) from DNA. For developing embryos, exposure to mustard gas can cause sérious deformities because guanine 
(1) stores the building blocks of proteins
(2) supports the structure of ribosomes
(3) produces energy for genetic transfer
(4) is part of the genetic code

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