To determine which portion of our DNA codes for proteins, we need to consider the biological data regarding the human genome.
1. We start by looking at our options: 2%, 15%, 0.23%, and 99.9%.
2. Knowing that only a small portion of our DNA is involved in coding for proteins, we'll compare each option to what we know about DNA coding portions.
3. Option 99.9% is much too high. The vast majority of our DNA does not code for proteins; in fact, it includes regulatory elements, introns, and other non-coding regions. Thus, 99.9% is not realistic.
4. Option 15% is still on the higher side. While this is closer to being realistic compared to 99.9%, scientific studies have shown that this percentage is higher than the actual amount that codes for proteins.
5. Option 0.23% seems too low. Even though a significant portion of our DNA is non-coding, this percentage is smaller than what scientific consensus suggests.
6. Finally, Option 2% is a reasonable and accurate figure based on our understanding. A small but significant fraction of our DNA forms the instructions for creating proteins.
Therefore, approximately 2% of our DNA codes for proteins. This small percentage is crucial as it contains the instructions for constructing the proteins that carry out various functions essential to the survival and operation of our cells and body.
