During transcription a new mRNA molecule is synthesized by complementing a fragment of the DNA template strand. In the exposed example, the correct labels in the blanck spaces are (from left to right): U - C - G - A.
What is transcription?
Transcription is the process through which mRNA molecules are synthesized in the nucleus.
This event uses a fragment of the DNA template strand to grow a new mRNA complementary molecule. These DNA segments carry the necessary information to build a new protein. mRNA copies this information and takes it to the cytoplasm, where protein synthesis occurs.
mRNA nucleotides include
- adenine (which pair with DNA thymine),
- uracyl (which pairs with DNA adenine),
- guanine (which pairs with cytosine), and
- cytosine (which pairs with guanine).
Notice that RNA molecules do not have thymine. This base is replaced by uracyl.
In the exposed example, we have a growing mRNA and we need to place the correct nucleotides to complement the DNA template strand.
DNA template strand: T A G C T T A A C
mRNA molecule: A U C G A A U U G
the correct labels in the blanck spaces are (from left to right): U - C - G - A
You can learn more about transcription at
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