Agene mutation causes the ldl receptor to have a different shape so that it no longer interacts with ldl and receptor-mediated endocytosis is not stimulated to take ldl into cells. ldl then increases in the extracellular fluid, which includes plasma in the bloodstream, causing high blood levels of ldl. ldl is a transport particle for cholesterol, and is known as "bad cholesterol." this is an example of which theme in physiology?

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 is the name of the two satelites on mars

9. the history of life on earth is recorded in