<prompt> Which of the following is the complimentary sequence of 5 TTAAGCTAC 3?5 GTACGCTTAA 35 AATTCGCATG 35 CATGCGAATT 35 TTAAGCGTAC 3  <response>: The complementary sequence of 5 TTAAGCTAC 3 is 3AATTCGCATG 5or 5 GTACGCTTAA 3. Complementary sequence of 5-3 end always proceeds from 3- 5. In the double stranded DNA, the bases of one strand of DNA pairs with the bases of the second strand in such a way that Adenine A always pairs with Thiamine T and Cytosine C always pairs with Guanine G. Ref: Harper Illustrated Biochemistry, 26th Edition, Chapter 35, Page 303 ; Lippincotts Illustrated Reviews: Biochemistry, 3rd Edition, Chapter 29, Page 395 