163 Visual Connection Questions

1. Figure 16.6 In E. coli, the trp operon is on by default, while the lac operon is off. Why do you think that this is the case?

2. Figure 16.8 In females, one of the two X chromosomes is inactivated during embryonic development because of epigenetic changes to the chromatin. What impact do you think these changes would have on nucleosome packing?

3. Figure 16.14 An increase in phosphorylation levels of eIF-2 has been observed in patients with neurodegenerative diseases such as Alzheimer’s, Parkinson’s, and Huntington’s. What impact do you think this might have on protein synthesis?

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