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7. The NATO alliance initially represented an important United States commitment to

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Active transport requires membrane protein transporters that use energy to transport molecules against their concentration gradients. At low concentrations of substrate outside the cell, many transporters are available, and the rate increases as the substrate concentration outside the cell increases. At higher concentrations of substrate, the transporters become more fully occupied, and the rate of import plateaus until all the transporters are transporting molecules as fast as they can. At that point, the only way to increase the rate of transport is to increase the number of transporters. So the kinetics will look like facilitated diffusion, but with the availability of energy the transporters work against the concentration gradient. An example is phosphate transport, where transporters can import submicromolar levels of phosphate even when the cytoplasmic phosphate concentration is much higher.

#19 which of the following terms was not part of the 1783 Treaty of ParisA.Britain agreed to remove troops from U.S. territoryB. The importation of slaves was bannedC.The borders of the U.S. were establishedD. The U.S. agreed to pay existing debts owed to EnglandE. The U.S. agreed not to persecute loyalists remaining in the country

- Heme is a constituent of hemoglobin, myoglobin, and cytochromes - Heme is synthesized in most cells of the body- The liver is the main nonerythrocyte source of its synthesis- Heme is a porphyrin, a cyclic compound that contains four pyrrole rings linked together by methenyl bridges- It is synthesized from glycine and succinyl-coenzyme A, which condense to form 5-aminolevulinate (5-ALA)- This reaction is catalyzed by 5-ALA synthase, located in mitochondria, and is rate limiting in heme synthesis

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