Final answer:
To correctly represent RNA structure in his presentation, Antonio must ensure his 3-D models follow the base pairing rules of A with U and G with C. Any model not reflecting these rules or suggesting RNA as double-stranded would be incorrect.
Step-by-step explanation:
RNA Structure and Base Pairing Rules
The process of transcription in RNA molecules involves the copying of genetic information from DNA to RNA. RNA, typically single-stranded, has a unique structure allowing intramolecular base pairing between complementary nucleotides. This base pairing contributes to the RNA's three-dimensional structure, crucial for its function.
In RNA, adenine (A) pairs with uracil (U), while guanine (G) pairs with cytosine (C). Antonio's presentation on transcription and 3-D RNA models must reflect these pairing rules. A model that does not abide by these base-pairing rules would be incorrect. If a created RNA model suggests a base pairing other than A with U or G with C, it does not comply with the known base pairing rules of RNA. In a DNA double helix, discovered by Watson and Crick, the pairing is slightly different, with adenine pairing with thymine (T) instead of uracil. For RNA models, showing A paired with T or any non-complementary pairing would be inaccurate.
As such, if Antonio has a 3-D RNA model in his presentation where these base-pairing rules are not followed, that model would be the one that does not abide according to what is known about RNA and base pairing. His models should also depict RNA as single-stranded molecules that could form secondary structures, such as hairpin loops, due to intramolecular base pairing.