AP Success - AP Biology Conceptual Analysis: Energetics in Cold-Adapted Bacteria

A newly discovered bacterium is found to thrive in extremely cold environments. The bacterium has a unique enzyme that allows it to metabolize its food even at freezing temperatures. Upon further investigation, researchers have found that the enzyme maintains its activity even at -20°C, a temperature at which most enzymes would lose their function.

Describe the role of enzymes in the metabolism of this bacterium.

The unique enzyme has a significantly different structure than its counterparts in other bacteria. It is found to have a higher proportion of α-helices and less β-sheets compared to similar enzymes in other bacteria. Explain how these structural differences might allow the enzyme to function at such low temperatures.

If the temperature of the bacterium's environment were to increase significantly, predict the likely impact on the bacterium's metabolism.

Scientists claim that the unique enzyme structure of this bacterium could be used to develop new cold-tolerant crops through genetic engineering. Justify this claim using your understanding of energetics and molecular biology.