If a dna strand contains the sequence 5ê¹-attccggatcga-3ê¹, which of the following is the sequence of the complementary strand of dna?
5ê¹-taaggcctagct-3ê¹
5ê¹-attccggatcga-3ê¹
3ê¹-taaccggtacgt-5ê¹
5ê¹-tcgatccggaat-3ê¹

3ʹ-TAACCGGTACGT-5ʹ

Explanation:

DNA is a molecule located in the cell nucleus and formed by two strands in the form of a double helix. It is responsible for storing all genetic information that defines the characteristics of each living organism.

The two complementary strands that make up this molecule are composed of a sequence of nucleotides, which are molecules composed of a phosphate group, a sugar (pentose) and a nitrogenous base that can be: Adenine (A), Thymine (T), Guanine (G) and Cytosine (C).

Nitrogenous bases are always organized in pairs: Adenine with Thymine (A-T) and Cytosine with Guanine (C-G). Therefore, we can conclude that if one of the DNA strands has the 5ʹ-ATTCCGGATCGA-3ʹ base sequence, the complementary strand will have the 3ʹ-TAACCGGTACGT-5ʹ base sequence.

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