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:单项选择题

类似问题

A 62.9 kg lady is standing on a weighing scale in an elevator as shown in the diagram below. Assume gravitational acceleration = 15 ms-2 Given that the elevator is accelerating upwards at 3.7 ms-2 , determine the magnitude of the normal force on the lady.

An object is fired from ground level at an angle of 31.9 degrees to the horizontal. Taking acceleration due to gravity = 7.65 ms-2 If the initial speed is 5.6 ms-1, how far from the starting point will it hit the ground? Assume air resistance is negligible.

Which of the following equations of motion would be used to calculate the displacement given the initial and final velocities as well as the acceleration?

A 51.8 kg lady is standing on a weighing scale (calibrated to 9.81 ms-2) in an elevator as shown in the diagram below. The scale is then calibrated to 7.67 ms-2 Given that the elevator is accelerating downwards at 2.2 ms-2 , determine the reading on the scale.

An object is fired from ground level at an angle of 39 degrees to the horizontal. Taking acceleration due to gravity = 7.65 ms-2 If the initial speed is 6.8 ms-1, how far from the starting point will it hit the ground? Assume air resistance is negligible.

Which of the following equations of motion would be used to calculate the displacement given the initial and final velocities as well as the time taken?

Which of the following is the best example of a homogeneous product?

Which of the following is not a limitation of using fiscal policy as a tool to achieve macroeconomic goals?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单