All stable atoms are . a. positively charged, with the number of protons exceeding the number of electrons. b. negatively charged, with the number of electrons exceeding the number of protons. c. neutral, with the number of protons equaling the number of electrons. d. neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons.

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

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.

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat