High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. citric acid binds to the enzyme at a different location from the active site. this is an example of high levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. citric acid binds to the enzyme at a different location from the active site. this is an example of the specificity of enzymes for their substrates competitive inhibition positive feedback regulation allosteric regulation

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

Describe characteristics of a good respitory surface

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above