a type of molecule (= the simplest unit of a chemical substance) that is involved in the processes that keep an organism alive

The damage caused by Alzheimer's Disease is observed within every class of biomolecule, including nucleic acids, proteins, lipids and carbohydrates. 阿耳茨海默氏病所造成的损伤在每一类生物分子中都能观察到，包括核酸、蛋白质、脂质和碳水化合物等。