1. Base Pairing:
* DNA: Uses thymine (T) to pair with adenine (A).
* RNA: Uses uracil (U) to pair with adenine (A).
2. Sugar:
* DNA: Contains deoxyribose sugar.
* RNA: Contains ribose sugar.
3. Structure:
* DNA: Double-stranded helix.
* RNA: Typically single-stranded, although it can fold into complex structures.
4. Function:
* DNA: Stores genetic information.
* RNA: Involved in protein synthesis and other cellular processes.
The Nucleotide Sequence:
The coding strand of DNA is often referred to as the "sense" strand because its sequence is almost identical to the RNA sequence (with the exception of thymine being replaced by uracil). However, it's important to remember that RNA is synthesized from the template strand (non-coding strand) of DNA.
Here's a simplified explanation:
1. DNA template strand: The sequence of bases in the template strand is complementary to the coding strand.
2. Transcription: During transcription, RNA polymerase reads the template strand and builds a complementary RNA molecule.
3. RNA sequence: The resulting RNA molecule has a sequence that is almost identical to the coding strand, except for the replacement of thymine with uracil.
Example:
* Coding strand DNA: 5'-ATGCGT-3'
* Template strand DNA: 3'-TACGCA-5'
* RNA produced: 5'-AUGCGU-3'
In summary:
The coding strand of DNA serves as a blueprint for RNA synthesis. It contains the same nucleotide sequence as the RNA, with the exception of uracil replacing thymine. The template strand is the actual strand used by RNA polymerase to create the RNA molecule.
