Psychrophilic bacteria grow best at which of the following temperatures?
**Core Concept**
The question tests the understanding of psychrophilic bacteria, which are a type of **extremophile** that thrives in low-temperature environments. These bacteria have adapted to grow optimally in cold conditions. The term "psychrophilic" refers to organisms that are cold-loving.
**Why the Correct Answer is Right**
Psychrophilic bacteria are characterized by their ability to grow best at temperatures below 20°C. They have enzymes that are adapted to function efficiently at low temperatures, allowing them to metabolize and reproduce in cold environments. This adaptation enables them to dominate ecosystems such as Arctic and Antarctic regions.
**Why Each Wrong Option is Incorrect**
**Option A:** This temperature is too high for psychrophilic bacteria.
**Option B:** This is also too high for optimal growth of psychrophilic bacteria.
**Option D:** This temperature is not suitable for psychrophilic bacteria, which cannot survive at such high temperatures.
**Clinical Pearl / High-Yield Fact**
Psychrophilic bacteria can cause spoilage of refrigerated foods, highlighting the importance of proper food storage and handling.
**Correct Answer:** C. 0-10°C