Strand to be tran

To determine how the deletion of the red outlined structure affects structure F, it's important to identify what the red structure is. Based on the context given, it likely refers to a part of the genetic information, such as a DNA region.

In the original state, if the base sequence of structure F is given as AAG, and if this is a codon derived from mRNA (which would be transcribed from DNA), then we should consider how changes to DNA can affect mRNA codons:

- AAG is the codon for the amino acid lysine.
- If the deletion of the red outlined structure alters the transcription or splicing process, it might change how the genetic code is read.
- The possible changes in the codon could depend upon which bases are deleted and how the reading frame is maintained.

However, without the specific details about what the red structure represents and which part of the DNA or RNA is being altered, it's challenging to give a definitive answer.

Among the provided options, let's analyze each:
1. **AAG to UAG**: This represents a change to a stop codon, signaling termination of translation.
2. **AAG to AUG**: This suggests a change to the start codon (Methionine).
3. **AAG to UUU**: This would switch the codon to one that codes for phenylalanine.
4. **AAG to AGU**: This would change the codon to one that codes for serine.

Given that the change would stem from a deletion, typically the codon would likely either change drastically or not lead to a direct translation of lysine.

Without additional information, it's impossible to definitively choose the correct option. However, if the deletion leads to a major frame shift or a termination codon, the logical answer would be that the codon could change to a stop codon (UAG), which would halt translation. Therefore, **the most likely answer could be**:

**The base sequence of the codon, structure F, would change from AAG to UAG.**

But you should confirm this against the specific context of the deletion and what it is removing within the DNA or RNA structure.