The nuclide nb decays by beta emission with a half-life of 1.23 hours. the mass of a 97nb atom is 96.908 u. (a) how many grams of "'nb are in a sample that has a decay rate from that nuclide of 456 sl? (b) after 5.04 hours, how many grams of %7nb remain?

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

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.