Some bacteria are metabolically active in hot springs because:

Question

BlackTom AI · Accepted Answer

When evaluating why some bacteria are metabolically active in hot springs, we need to connect temperature with enzyme function.
Option a: 'they are able to maintain a lower internal temperature.' In thermophilic organisms, the opposite is true—they maintain stability at high temperatures, not a lower internal temperature. This makes the statement incorrect.
Option b: 'high temperatures make catalysis unnecessary.' Elevated temperatures do not eliminate the need for catalysis; enzymes catalyze reactions, and their activity is highly temperature-dependent. At high temperatures, many enzymes would denature if they were not adapted, so this is inaccurate.
Option c: 'their enzymes have high optimal temperatures.' This aligns with what we know about thermophiles: their proteins and enzymes are adapted to function best at elevated temperatures, allowing metabolism to proceed in hot springs. This is the correct idea.
Option d: 'their enzymes are completely insensitive to temperature.' No biological enzyme is completely insensitive to temperature; most have an optimal range and are sensitive to heat or cold. This makes the statement false.
Option e: 'they are able to utilise fermentation rather than aerobic respiration.' While some microorganisms can ferment, hot springs host a variety of metabolisms, including respiration; stating that fermentation is the sole or predominant means is misleading. Therefore this option is not generally correct.
In summary, only option c accurately reflects the reason bacteria remain metabolically active in hot springs—their enzymes have high optimal temperatures, enabling proper catalysis in hot conditions. The other choices misstate enzyme temperature relationships or metabolic flexibility in thermophiles.

Some bacteria are metabolically active in hot springs because:Single choice

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