Substance commonly used for tissue preservation commonly is:
**Core Concept**
Tissue preservation involves maintaining the viability of cells and tissues for a short period, which is crucial in medical and scientific research, transplantation, and forensic analysis. The process requires a substance that can effectively prevent cellular degradation and maintain the integrity of tissues.
**Why the Correct Answer is Right**
The correct answer is Formalin, a solution of formaldehyde (CH2O) in water. Formalin is commonly used for tissue preservation due to its ability to cross-link proteins and other cellular components, thereby preventing cellular degradation and maintaining tissue structure. This process involves the formation of methylene bridges (-CH2-) between amino groups, resulting in the stabilization of cellular proteins and membranes.
**Why Each Wrong Option is Incorrect**
**Option A:** None of the other options are commonly used for tissue preservation.
**Option B:** Ethanol is used as a preservative in some medical applications, but it is not as effective as formalin in maintaining tissue structure and preventing cellular degradation.
**Option C:** Phenol is a disinfectant and preservative, but it is not commonly used for tissue preservation due to its toxicity and potential for tissue damage.
**Clinical Pearl / High-Yield Fact**
Remember that formalin is a potent carcinogen and requires proper handling and disposal to prevent exposure and potential health risks.
**Correct Answer:** C. Formalin.