One strand of double helix of DNA reads 5 AAATTCGA-3 Which of the following strands can form double helix?

5-TTAAGCT-3

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3-TTTAAGCT-5

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5-TTTAACGA-3

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3-TTTAACGA.3

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Solution

The correct option is C 3-TTTAAGCT-5
Two complementary DNA strands pair together to form a double helical structure. In DNA, A bonds with T and G bonds with C, Vice-versa is also true. Also, the two strands have opposite polarity.
Hence, the correct answer is '3-TTTAAGCT-5'

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