Questions: According to the Central Dogma, which is the correct flow of genetic information? DNA → RNA → Protein Protein → RNA → DNA DNA → Protein → RNA RNA → DNA → Protein

The answer is the first one: DNA $\rightarrow$ RNA $\rightarrow$ Protein.

Explanation for each option:

1. DNA $\rightarrow$ RNA $\rightarrow$ Protein: This is the correct flow of genetic information according to the Central Dogma of molecular biology. It describes the process where DNA is transcribed into RNA, which is then translated into protein.
2. Protein $\rightarrow$ RNA $\rightarrow$ DNA: This is incorrect. Proteins do not serve as templates for RNA synthesis, nor do they reverse transcribe into DNA.
3. DNA $\rightarrow$ Protein $\rightarrow$ RNA: This is incorrect. DNA is not directly translated into protein without the intermediate RNA step.
4. RNA $\rightarrow$ DNA $\rightarrow$ Protein: This is incorrect in the context of the Central Dogma. While reverse transcription (RNA to DNA) does occur in some viruses, it is not the standard flow of genetic information in cells.

Summary: The correct flow of genetic information according to the Central Dogma is DNA $\rightarrow$ RNA $\rightarrow$ Protein.