Question

gene expression can occur at several points along the pathway from dna to rna to proteins. in one example of gene expression, the protein insulin must be trimmed to a smaller size. how is this an example of gene expression? ○ until the protein is trimmed, the ribosomes are not active. ○ until the protein is trimmed, the shape of the dna blocks transcription. ○ until the protein is trimmed, transcription is blocked by a repressor protein. ○ until the protein is trimmed, it is not useful to the cell.

Explanation:

Gene expression involves the production of functional proteins. Ribosomes are active during translation (protein synthesis), not dependent on protein trimming. DNA shape for transcription is not related to protein trimming here. Transcription - blocking by repressor is a different regulation (not about protein trimming). Proteins often need post - translational modifications (like trimming) to be functional. If insulin isn't trimmed, it can't perform its role (e.g., regulating blood sugar), so it's not useful to the cell. This shows how gene expression (ultimately producing a functional protein) is affected by this post - translational step.

Answer:

Until the protein is trimmed, it is not useful to the cell.