The term amphipathic describes the characteristic of some molecules that have ________.
A) two polar regions
B) only a single polar region
C) both a polar and a nonpolar region
D) no polar regions
E) two nonpolar regions
C) both a polar and a nonpolar region
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The TCA cycle generates all of the following from each acetyl-CoA molecule oxidized except
A. two ATP or GTP molecules. B. one FADH2 molecule. C. three NADH molecules. D. two CO2 molecules.
Lizards and snakes are living members of the ____ lineage
a. Testudines b. Archosauria c. Squamata d. Sphenodontida e. Amphibia
Among air breathing animals, birds have the most effective mechanism of extracting oxygen from air
because
a. birds utilize countercurrent exchange. b. bird lungs have more surface area. c. bird lungs are the largest among vertebrates. d. the air sacs provide additional respiratory surfaces. e. birds utilize positive force exchange.
Based on new information from the Human Microbiome Project, the human body typically begins to be colonized by its normal biota
A. during puberty. B. during and immediately after birth. C. before birth, in utero. D. when a child first goes to school. E. when an infant gets its first infectious disease.