The hormone ________, secreted by the ________, stimulates the production of red blood cells when the level of oxygen in the body decreases
Fill in the blank(s) with correct word
erythropoietin; kidney
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The outer membrane of the mitochondrion is not a significant permeability barrier because it contains transmembrane proteins called ________.
Fill in the blank(s) with the appropriate word(s).
The chemical structure of chlorophyll is based on a complex organic ring structure, a long
hydrophobic side chain and an atom of _________ in the center of the ring.
a. carbon b. manganese c. magnesium d. iron e. nitrogen
Which of the following happens when there are high levels of nitrogen and phosphorus in a lake or pond?
a. The growth of algae decreases significantly. b. The photic level gets deeper. c. The growth of algae increases significantly. d. Zooplankton populations increase.
What are some of the possible factors associated with aging?
What will be an ideal response?