* Incorrect Amino Acid Sequence: DNA contains the genetic code for proteins, but it's read in a specific direction (from 5' to 3'). Transcribing the wrong strand would lead to a completely different sequence of nucleotides in the mRNA. This mRNA would then be translated into a protein with a drastically different amino acid sequence.
* Non-Functional or Harmful Protein: The protein produced from the wrong strand is likely to be:
* Non-functional: The incorrect amino acid sequence would disrupt the protein's structure and prevent it from performing its intended role in the cell.
* Harmful: The altered protein could have a completely different function, potentially interfering with other cellular processes or even being toxic to the cell.
* Loss of Function: If the protein encoded by the wrong strand is essential for a vital cellular function, the cell could suffer serious consequences, including:
* Disease: This type of error can contribute to genetic disorders and other diseases.
* Cell Death: The lack of a crucial protein might lead to the cell's death.
Example: Imagine a gene that codes for an enzyme that breaks down a specific sugar. If RNA polymerase transcribes the wrong strand, the resulting protein might be:
* Inactive: It might not be able to break down the sugar, leading to its accumulation in the cell.
* Harmful: It might bind to a different molecule, disrupting another cellular process.
In Summary: Transcribing the wrong strand of DNA is a serious error that can lead to the production of non-functional or harmful proteins, with potentially devastating consequences for the cell.
Important Note: There are mechanisms in place within the cell to minimize these errors, such as:
* Transcription factors: These proteins help RNA polymerase bind to the correct start site on the DNA.
* Proofreading mechanisms: RNA polymerase itself has some proofreading capabilities to correct errors during transcription.
* Quality control: Proteins produced by ribosomes are also subject to quality control mechanisms that can identify and degrade faulty proteins.
