How is radioactive decay used to date sedimentary rocks? a. the amounts of potassium and argon in sedimentary rocks are measured. b. the amounts of carbon-14 and nitrogen in sedimentary rocks are measured. c. the amounts of unstable elements in each layer of the sedimentary rocks are compared. d. the amounts of unstable elements in the volcanic layers above and below the sedimentary layers are measured

You have a solution that contains phospholipid vesicles in a test tube. these vesicles have phospholipid bilayers, but do not contain any membrane transporters. you add a number of different molecules to the solution, and wait a period of time for them to equilibrate. if you could measure the concentration of each molecule, for which of the following would you expect to measure equal concentrations inside and outside of the vesicles? assume for this question that the overall osmolarity inside and outside the vesicles is the same (that is, there is no appreciable diffusion of water across the membrane). (select two answers) an amino acid with a hydrophobic side-chain a small non-polar molecule a negatively charged ion a small polar molecule a small lipid hormone

What came first egg or chicken? and is tomato a vegetable or a fruit?

What is one function of the embedded proteins