Question at position 2 The normal flow of genetic information for gene expression is best represented in which of the answers below?RNA ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ DNA ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ ProteinProtein ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ RNA ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ DNADNA ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ RNA ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ ProteinProtein ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ DNA ⟶\longrightarrow⟶ $⟶$ ⟶ $⟶$ RNAGene expression involves DNA (genes) only

Question

Question at position 2 The normal flow of genetic information for gene expression is best represented in which of the answers below?RNA ⟶\longrightarrow⟶

⟶

⟶

⟶

DNA ⟶\longrightarrow⟶

⟶

⟶

⟶

ProteinProtein ⟶\longrightarrow⟶

⟶

⟶

⟶

RNA ⟶\longrightarrow⟶

⟶

⟶

⟶

DNADNA ⟶\longrightarrow⟶

⟶

⟶

⟶

RNA ⟶\longrightarrow⟶

⟶

⟶

⟶

ProteinProtein ⟶\longrightarrow⟶

⟶

⟶

⟶

DNA ⟶\longrightarrow⟶

⟶

⟶

⟶

RNAGene expression involves DNA (genes) only

BlackTom AI · Accepted Answer

This question asks about the normal flow of genetic information for gene expression.
Option 1: 'RNA ⟶⟶⟶ DNA ⟶⟶⟶ Protein' — This reverses the central dogma. RNA is transcribed from DNA, not DNA from RNA in this direction, so this sequence is incorrect.
Option 2: 'Protein ⟶⟶⟶ RNA ⟶⟶⟶ DNA' — This implies that proteins guide the synthesis of RNA and DNA, which is not how genetic information is stored or transmitted. It contradicts the established flow from nucleic acids to proteins, making this option incorrect.
Option 3: 'DNA ⟶⟶⟶ RNA ⟶⟶⟶ Protein' — This matches the central dogma: DNA is transcribed into RNA, and RNA is translated into protein. It correctly describes the sequential flow of genetic information.
Option 4: 'Protein ⟶⟶⟶ DNA ⟶⟶⟶ RNA' — This suggests that proteins direct the creation of DNA and then RNA, which is not how genetic information is organized and transmitted; thus it is incorrect.
Option 5: 'Gene expression involves DNA (genes) only' — This is an oversimplification. Gene expression involves transcription of DNA into RNA and subsequent translation into proteins; it is not limited to DNA alone, so this statement is inaccurate.
In summary, evaluating each option against the established steps of transcription and translation shows that only the third option correctly represents the normal flow from DNA to RNA to Protein.

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