Which of the following properties of chloroplasts and mitochondria does not provide
support for the endosymbiont theory that present-day eukaryotic cells are
descendants of a successful symbiotic relationship between a host cell and an
engulfed prokaryote?
•they have a double membrane that resembles that of some ancient prokaryotic cells.
•they have their own dna and also replicate in a manner similar to some
bacteria cells.
•their inner membranes contain the same enzymes as prokaryotic plasma membranes.
•they are able to produce atp molecules to power metabolic processes of
the cell

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).

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.

If a grape were placed in a hypertonic solution what would happen and why?