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  • DNA Complementary Strand & mRNA Synthesis: A Step-by-Step Guide
    Here's how to write the complementary strand and mRNA for the DNA sequence "atggacaaactcaactca":

    1. Complementary Strand

    * Base pairing rules: Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C).

    * Reverse the sequence: Since DNA strands run in opposite directions (5' to 3' and 3' to 5'), we need to reverse the sequence.

    Therefore, the complementary strand is: tgagttgagtttgtcca

    2. mRNA

    * Replace Thymine (T) with Uracil (U): RNA uses Uracil instead of Thymine.

    Therefore, the mRNA sequence is: ugaguugaaguuguccaa

    Complete answer:

    * Complementary strand: tgagttgagtttgtcca

    * mRNA: ugaguugaaguuguccaa

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