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# If one side of a DNA molecule reads ATGCCGT, what would the complementary side read?

Mar 8, 2018

See Below

#### Explanation:

I've gotten used to writing DNA from the 5$end to the 3$ end (5 prime, 3 prime). The other way of saying it is Top Strand and Bottom Strand....you've got written the top strand, and you want the complement, or bottom strand.

5$ATGCCGT 3' 3' t a c ggca 5' so the complementary strand would read: (5$-3`)
acggcat

Mar 8, 2018

$\text{TACGGCA}$

#### Explanation:

We want to find the complementary strand of $\text{ATGCCGT}$.

Remember that $\text{A}$ is adenine, $\text{G}$ is guanine, $\text{C}$ is cytosine, and $\text{T}$ is thymine.

Adenine always bonds with thymine, and guanine only bonds with cytosine. In $\text{RNA}$ however, uracil $\left(\text{U}\right)$ is substituted for thymine instead.

So, in translation, adenine turns into thymine, and guanine turns into cytosine, and vice-versa.

So, the complementary side would read $\text{TACGGCA}$.