Which of the following statements does not describe the structure of an atom?   an atom has a small, dense center called the nucleus.   inside the nucleus of an atom are protons and electrons.   protons are positively charged sub-atomic particles.   electrons are negatively charged sub-atomic particles.

Effect of rotenone and antimycin a on electron transfer rotenone, a toxic natural product from plants, strongly inhibits nadh dehydrogenase of insect and fish mitochondria. antimycin a, a toxic antibiotic, strongly inhibits the oxidation of ubiquinol. (a) explain why rotenone ingestion is lethal to some insect and fish species. (b) explain why antimycin a is a poison. (c) given that rotenone and antimycin a are equally effective in blocking their respective sites in the electron-transfer chain, which would be a more potent poison? explain.