[Answer] In a DNA double helix an adenine of one strand always pairs with a(n) _____ of the complementary strand and a guanine of one strand always pairs with a(n) _____ of the complementary strand.A) guanine ... adenineB) thymine ... cytosineC) uracil ... cytosineD) cytosine ... uracilE) cytosine ... thymine

Answer: B) thymine ... cytosineThis is referred to as specific base pairing.

Most relevant text from all around the web:

In a DNA double helix an adenine of one strand always pairs with a(n) _____ of the complementary strand and a guanine of one strand always pairs with a(n) _____ of the complementary strand.A) guanine ... adenineB) thymine ... cytosineC) uracil ... cytosineD) cytosine ... uracilE) cytosine ... thymine In a DNA double helix an adenine of one strand always pairs with a(n ) _____ of the complementary strand and a guanine of one strand always pairs with a(n ) _____ of the complementary strand . ... _____ of the complementary strand . thymine ... cytosine . After DNA replication is completed _____. each new DNA double helix consists of one old DNA ... In a DNA double helix an adenine of one strand always pairs with a(n ) _____ of the complementary strand and a guanine of one strand always pairs with a(n ) _____ of the complementary strand . True- When the 3' end of one DNA strand points in the same direction as the 5' end of the other DNA strand the strands are said to be antiparallel. In a DNA double helix an adenine of one strand always pairs with a(n ) _____ of the complementary strand and a guanine of one strand always pairs with a(n ) _____ of the complementary strand . In a DNA double helix an adenine of one strand always pairs with a(n ) _____ of the complementary strand and a guanine of one strand always pairs with a(n ) _____ of the complementary strand . ... _____ of the complementary strand . thymine ... cytosine . After DNA replication is completed _____. each new DNA double helix consists of one old DNA ... In a DNA double helix an adenine of one strand always pairs with ...

Disclaimer: 

Our tool is still learning and trying its best to find the correct answer to your question. Now its your turn, "The more we share The more we have". Comment any other details to improve the description, we will update answer while you visit us next time...Kindly check our comments section, Sometimes our tool may wrong but not our users.

Are We Wrong To Think We're Right? Then Give Right Answer Below As Comment