11. Select the incorrect statement from those below. been coated with silica gel (SiO2) or alumina (A1203), known as the stationary adsorbent phase. A. TLC involves spotting a dilute solution (1%) of sample on one end of a small sheet that has B. TLC is a form of liquid chromatography consisting of a mobile phase (developing solvent) and a plate or strip coated with a form of silica gel (a stationary phase) C. In TLC, the mobile phase is the solvent- usually a polar liquid D.) In TLC, the stationary phase is a thin layer of absorbent particles- usually a polar solid material like silica on or E. In TLC, SiO2 is used for separation of more polar compounds while A1203 is used in the separation of non-polar compounds. 12. Which of these statements below are true of thin layer chromatography? A. The mode of separation is generally by adsorption or partition B. The more polar components are adsorbed preferentially by the polar layer (C) Hydrogen bonding is the main force controlling adsorption between the silica gel surface and the analyte functional groups D. Silica gel with or without an added fluorescing indicator is the most commonly used stationary phase in normal phase chromatography E, all of the above 13- The ketone bodies are A. Acetone B. Acetoacetate C. beta-hydroxybutyrate D. all of the above E none of the above 14- Ketone bodies are the main metabolic fuel of which of these tissues? A. Heart B. Kidney C. Muscle. D. Brain during starvation E. all of the above 15-Although the liver is the site of major production of ketone bodies, it does not utilize them because of a lack of this enzyme in sufficient quantity. A. succinyl CoA:acetoacetate CoA transferase. (HMG-CoA) B. B-hydroxy-B-methylglutaryl-CoA C. acyl CoA dehydrogenase D. HMG-CoA synthase (EHMG-CoA reductase F. HMG-CoA reductase 16. Which one of the following statements about utilization of ketone bodies as a fuel by the body is INCORRECT? A. They are soluble in aqueous solution and therefore do not require carriers in the blood. B. When plasma ketone body levels are elevated, the liver efficiently oxidizes them for energy. C) They are made in response to elevated levels of fatty acids in the liver, where the amount of acetyl CoA exceeds the oxidative capacity of the liver. D. Acetone is not utilized by the body as a fuel. E. Unlike fatty acids, they can be oxidized by the brain.