Question

What effect can mRNA editing have on a newly transcribed mRNA?

1) It can create new splice sites.
2) It can generate new start codons.
3) It can generate stop codons.
4) It can lead to amino acid substitutions.

a)1,3,4
b)2,3,4
c)3,4
d)2,3
e)1

Answer 1

mRNA editing can create new splice sites, generate stop codons, and lead to amino acid substitutions.

Step-by-step explanation:

Messenger RNA (mRNA) editing can have several effects on a newly transcribed mRNA. It can create new splice sites, which can lead to alternative splicing and the generation of different proteins. mRNA editing can also generate stop codons, resulting in shorter proteins. Additionally, it can lead to amino acid substitutions, altering the sequence of the protein.

For example, in humans, mRNA editing can result in the production of two forms of the APOB protein, with one form being smaller due to the addition of an earlier stop signal in the mRNA.