Which of the following is LEAST likely to be true when comparing a liver cell and a muscle cell?Group of answer choicesthey contain different sets of cis-regulatory elementsthey are both examples of differentiated cell typesthey express different RNA and proteinsexpress different transcription factorshave gained distinct structural and functional characteristics

The statement that is LEAST likely to be true when comparing a liver cell and a muscle cell is "they contain different sets of cis-regulatory elements".

Here's why:

1. "They contain different sets of cis-regulatory elements": This is not necessarily true. Cis-regulatory elements are regions of non-coding DNA which regulate the transcription of nearby genes. While it's possible that liver and muscle cells could have some differences in these elements due to their different functions, they are both still human cells and thus would share a large number of cis-regulatory elements.

2. "They are both examples of differentiated cell types": This is true. Both liver cells and muscle cells are differentiated, meaning they have developed specialized functions.

3. "They express different RNA and proteins": This is true. Different types of cells express different genes, which leads to the production of different RNAs and proteins.

4. "Express different transcription factors": This is true. Transcription factors are proteins that control the rate of transcription of genetic information from DNA to messenger RNA. Different cell types, like liver and muscle cells, would express different transcription factors to regulate their specific gene expression.

5. "Have gained distinct structural and functional characteristics": This is true. Liver cells and muscle cells have different structures and functions. For example, muscle cells are designed for contraction, while liver cells are specialized for tasks such as detoxification and metabolism.