A chain bracelet is found. It looks as though it might be made of either gold or of copper. When the bracelet is submerged in a graduated cylinder containing water, the volume of
the water rises from 9.2 cm' to 11.7 cm'. The bracelet has a mass of 45 g. Is the bracelet
made of gold or copper? (Note: The density of gold is 19.3 g/cm' and the density of
copper is 8.92 g/cm')

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.