Which of the following chemicals is most commonly used to preserve biological specimen?
Correct answer: A. Formalin
- A. Formalin
- B. Glutaraldehyde
- C. Ethylene Oxide
- D. Iodine
Explanation
Formalin is a solution of formaldehyde in water. It is the most common preservative used for biological specimens, as it is effective and inexpensive. Formalin preserves specimens by cross-linking proteins, which prevents them from decaying.
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Biology is divided into fields such as botany, zoology, microbiology, genetics, ecology, physiology and biotechnology, each focusing on a different aspect of life. Levels of biological organization progress from atoms and molecules through organelles, cells, tissues, organs and organ systems to organisms, populations, communities, ecosystems and the biosphere.
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