Question

question 80
which of the following statements correctly defines the process of gene expression?
○ gene expression is the process by which proteins direct the synthesis of dna.
○ gene expression is the process by which rna direct the synthesis of dna.
○ gene expression is the process by which dna directs the synthesis of proteins.
○ gene expression is the process by which proteins direct the synthesis of rna.

Explanation:

To determine the correct definition of gene expression, we recall the central dogma of molecular biology. Gene expression involves the process where the information in DNA (genes) is used to synthesize proteins. This occurs through transcription (DNA to RNA) and translation (RNA to protein).

• The first option is incorrect because proteins do not direct DNA synthesis in gene expression (reverse transcription is a different process, not the main gene expression).
• The second option is incorrect as RNA directing DNA synthesis is reverse transcription, not gene expression.
• The fourth option is incorrect as proteins do not direct RNA synthesis in gene expression (transcription is DNA - directed).
• The third option correctly states that gene expression is the process by which DNA directs the synthesis of proteins (through transcription and translation).

Answer:

C. Gene expression is the process by which DNA directs the synthesis of proteins.