Question

a mutation that substitutes one nucleotide for another occurs in the regulatory sequence of the spider silk gene in a transgenic yeast. what would you expect as an outcome? the spider silk protein produced may have a different three - dimensional shape. the timing of spider silk protein production may change. mrna will be unaffected. dna will be unaffected.

Explanation:

Regulatory sequences control gene expression timing/level, not protein structure (coding regions affect that). A mutation here can alter when the gene is turned on/off, changing production timing. mRNA could be affected (if expression level changes), and DNA has the mutation so it’s not unaffected.

Answer:

B. The timing of spider silk protein production may change.