Production of urine in the nephron begins with
a. filtration.
b. tubular reabsorption.
c. tubular secretion.
d. tubular modification.
e. active reabsorption.
A
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At a minimum, primary producers require water, carbon dioxide, and light. These are things that are readily available in most ecosystems. However, we do not observe the same rates of net primary productivity in every region of the globe
Which of the following statements best reflects one reason why rates of productivity are not the same everywhere? A. Rates of net primary productivity are actually the same everywhere; scientists just need to calculate the rates relative to plant biomass in a given ecosystem. B. Although water is limited in certain ecosystems, nutrients that are scarce actually limit net primary productivity because they are necessary for growth. C. Although water is limited in certain ecosystems, irrigation would solve the problem and equalize rates of net primary productivity in every ecosystem. D. Rates of net primary productivity are actually limited by the amount of solar radiation. If net primary productivity were calculated as a yearly average, then this would show that ecosystems have the same rate of productivity.
A researcher is interested in comparing the DNA sequence for the gene encoding myosin between a cheetah (mammal) and a red snapper (fish). Which database would be most helpful to her?
A. GenBank B. Swiss protein database C. Protein Information Resource D. Protein Data Bank E. Swiss protein and Protein Information Resource databases
A flat expanse of an ocean basin is called:
a. a seamount. b. an abyssal plain. c. an abyssal hills. d. an abyssal prairie. e. an underwater delta.
Beta-blockers are a class of drugs that target beta-adrenergic receptors, blocking the action of epinephrine and norepinephrine. These drugs are used to treat heart conditions, hypertension, glaucoma, and migraine headaches and are also used off-label to alleviate stage fright in performers. Since the beta-adrenergic receptor is a GPCR, what intracellular event is prevented by the use of a beta-blocker?
A. Transport of the receptor-hormone complex into the cell and the nucleus, where it would regulate transcription B. A protein kinase cascade, initiated by the receptor's intracellular kinase domain C. A protein phosphatase cascade, initiated by the receptor's intracellular phosphatase domain D. Release of an activated G protein subunit bound to GTP