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  4. One strand of a DNA has the following sequence of bases: ATGCTATTCAG In its complementary strand, the number of adenine base units will be

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Q. One strand of a DNA has the following sequence of bases: $ATGCTATTCAG $
In its complementary strand, the number of adenine base units will be _____

Biomolecules

Solution:

In DNA molecule, adenine $(A)$ always pairs with thymine $(T)$ and cytosine $(C)$ always pairs with guanine $(G)$.
The sequence of bases in the given strand is:
$ATGCTATTCAG $
Thus, the sequence of bases in the complementary strand is:
$TACGATAAGTC$
Therefore, there are $4$ adenine base units in the complementary strand.