Which one of the following is not true about RNA editing? Group of answer choicesRNA editing occurs mostly in mitochondria and chloroplasts.Deamination of G is a common reaction in RNA editing.RNA editing requires guide RNAs that have sequences complementary to the edited mRNADeamination of A is common reaction in RNA editingRNA editing allows for the synthesis of two different proteins from one gene.

One of the statements in the given options is not true about RNA editing. Let's analyze each statement step by step:

1. RNA editing occurs mostly in mitochondria and chloroplasts. This statement is true. RNA editing is known to occur predominantly in mitochondria and chloroplasts.

2. Deamination of G is a common reaction in RNA editing. This statement is true. Deamination of guanine (G) is indeed a common reaction in RNA editing.

3. RNA editing requires guide RNAs that have sequences complementary to the edited mRNA. This statement is true. RNA editing does require guide RNAs that have sequences complementary to the edited mRNA. These guide RNAs help in directing the editing process.

4. Deamination of A is a common reaction in RNA editing. This statement is not true. Deamination of adenine (A) is not a common reaction in RNA editing. It is primarily the deamination of cytosine (C) and guanine (G) that occurs during RNA editing.

5. RNA editing allows for the synthesis of two different proteins from one gene. This statement is true. RNA editing can indeed lead to the synthesis of two different proteins from a single gene. This is achieved by altering the nucleotide sequence of the mRNA through editing, which can result in the production of distinct protein isoforms.

Therefore, the statement that is not true about RNA editing is: "Deamination of A is a common reaction in RNA editing."