Hemoglobin is a protein that binds to oxygen. It is only produced by red blood cells and it allows blood to transport oxygen throughout the body. What statement does this information best demonstrate?
A.
Proteins with similar functions to those produced in humans can be found in other species
B.
Proteins in specialized cells are the result of the expression of particular genes.
C.
Specialized cells that are grouped together and perform similar functions are called tissues.
x D
The proteins produced by cells have structures that are related to their function.

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).

All ova contain sex chromosomes corresponding to: x y xx xy

In a cladogram, what occurs at a node? a derived trait appears. evolution is stopped. an ancestor dies. the cladogram ends. aa as s as ss what are the chances that their offspring will have sickle cell anemia? 0% 25% 50% 100%