Which of the following objects has polarity? A
the Earth, which has magnetic north and south poles

B
the city of Chicago, which has a North and Southside

C
a map of the country, which has a compass pointing north

D
an unmagnetized block of metal, which has a top and a bottom

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.