The test results below indicate the presence of which nutrient? four test tubes A. monosaccharide B. polysaccharide C. protein D. lipid Which of the following shows the results that you would get if you tested beef using the four tests in the Gizmo? 452 AQ2 A. test tubes A B. test tubes B C. test tubes C D. test tubes D Which test would show positive results for orange juice? A. Benedict test B. Lugol test C. Biuret test D. Sudan Red test Which foods would have the following nutrient test results? four test tubes A. beef, peanut butter, tuna B. apple juice, honey, orange juice C. candy, table sugar, cola D. pasta, bread, crackers Which of the following would test positive in the Biuret test, and negative in the Sudan Red test? A. skim milk B. wheat bread C. meatloaf D. vegetable oil

The kidney filters potentially toxic substances in the blood, and thus “clears” the blood of those substances. this clearance function is dependent upon and proportional to the diffusion gradient of the substance across filtering capillaries, i. e. if the concentration of the substance is doubled, twice as much will be cleared from each ml of blood that is filtered. suppose that the body produces a constant amount of a substance x per unit of time. the kidneys eliminate substance x at a rate directly proportional to the concentration of the substance and the volume of blood cleared each minute (c): elimination = c × [x], where [x] is the steady-state concentration of substance x. imagine an individual with an initial concentration of x equal to [x]0 who develops kidney disease. her baseline clearance c0 drops to one half of the original (½c0). what is the new steady state concentration of x? (for simplicity, assume that substance x is 100% filtered by the kidney).