[Campbell Biology P.135] If one strand of a DNA molecule has the base sequence 5'-TAGGCCT-3'... | Practice Question

If one strand of a DNA molecule has the base sequence 5'-TAGGCCT-3', what would be the sequence of its complementary strand?

  • A: 3'-ATCCGGA-5'
  • B: 5'-AUCGGAA-3'
  • C: 3'-AGGCGGT-5'
  • D: 5'-TAGGCCT-3'

Explanation

In DNA, adenine A pairs with thymine T , and guanine G pairs with cytosine C . Additionally, the complementary strand runs in the opposite 5' to 3' direction. So, for 5'-TAGGCCT-3', the complementary strand is 3'-ATCCGGA-5'.