Refer to the measurements in the table to determine which unidentified metal has the lowest density. MetalVolumeMass A12.5 cm3122 g B15.2 cm3129 g C13.1 cm3101 g D18.7 cm3126 g Metal A Metal B Metal C Metal D

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

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.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum