# If the sequence on a strand of a DNA molecule is C C C A C G T C T, what will the mRNA sequence from this DNA molecule be?

Mar 30, 2018

mRNA strand transcripted assuming this is from 5' to 3': $G G G U G C A G A$

#### Explanation:

$G G G U G C A G A$

For RNA complementary pairs are:
$A - U$
$G - C$

Mar 30, 2018

$\text{GGGUGCAGA}$

#### Explanation:

Let's assume that the $\text{DNA}$ strand starts with a $5 '$ end and ends with a $3 '$ end.

The complementary $\text{mRNA}$ strand will be as follows.

We notice that cytosine $\left(\text{C}\right)$ only bonds with guanine $\left(\text{G}\right)$, while adenine $\left(\text{A}\right)$ only bonds with thymine $\left(\text{T}\right)$. Since this is $\text{RNA}$, uracil $\left(\text{U}\right)$ is substituted for thymine $\left(\text{T}\right)$ instead. Note that all bonding here can happen vice-versa, i.e. cytosine turns to guanine and guanine turns to cytosine.

And so, the complementary strand will start $3 ' - 5 '$.

Change all the letters into their complementary counterparts, we get,

$3 ' - \text{GGGUGCAGA} - 5 '$

Hope this helps!

Mar 30, 2018

See Below

#### Explanation:

If we assume this is the top strand (on the 5 prime end),then the mRNA sequence will be the same as this sequence, except U in place of T, since the mRNA is transcribed off the bottom (complementary) strand. And the complement to the complementary strand is the same as the top strand.
mRNA5CCCACGUCU3

DNA
5CCCACGTCT3
3GGGTGCAGA5

mRNA is made off of the 3-5 piece of DNA, and the RNA polymerase places the complement to the strand (i′ll put mRNA in lowercase)

5c c c ac g uc u3
3GGGTGCAGA5`