1. A scientist tests a small section of a carrot root to determine which molecules were present. The basic results showed that the molecules contained carbon, hydrogen, and oxygen, with some arranged in a ringed pattern, providing structure and energy to the root. What inference can be made from this data? A) The molecules are a type of carbohydrate
B) The carrot root is mainly composed of proteins
C) The carrot contains some type of sugar
D) Both A and C are correct
2. Which of the following is an element found in all organic compounds?
A) Protein
B) Zinc
C) Iron
D) Carbon

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).

9. the history of life on earth is recorded in

Which statement does lola need to correct, and why? a) statement 1 because spiral galaxies do not havearmsb) statement 2 because the bulges contain mostlyyoung red stars.c) statement 3 because the arms are made of mostlyyoung blue and blue-white stars.d) statement 4 because spirals galaxies contain littleto no dust.(c)