Question: If one strand of DNA has a base sequence of 5-CTCATGAG-3, what is the base sequence of the complementary strand?
Explanation:
Remember that DNA is only synthesized in the 5' to 3' direction. Therefore, the sequence of a complementary strand can be determined if the sequence of the template strand is given. This is done by taking into account the complementarity of the nitrogenous bases. The complementary sequence is the nucleic acid sequence of bases that can form a double-stranded structure by matching base pairs.
Answer: according to the above information, we can conclude that the correct answer is:
The complementary sequence of 5-CTCATGAG-3 is:
3-GAGTACTC-5