How does fat enter the blood circulation?
a. across the lining of the mouth
b. through the hepatic portal system
c. across the stomach lining
d. through the lymph
e. across the large intestine lining
D
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Answer the question using the accompanying graph. Which portion of the graph shows the free energy of the reaction?
a. A b. B c. C
d. W + X e. Y + Z
What led to the increase in oxygen levels in the atmosphere on primitive Earth?
a. the first photosynthetic reactions b. photosynthetic cells that used water and not H2S as a source of electrons c. the development of cellular respiration pathways in cells d. the use of glycolysis in cells e. photosynthetic pathways that stripped oxygen off of carbon dioxide and retained only the carbon in subsequent steps
Which of the following U.S. agencies oversees phase testing of drugs prior to their approval for clinical uses?
A) USDA B) EPA C) FDA D) NIH E) NSF
Variations of homologous genes that result in differences in structure and function are
A) alleles. B) loci. C) autosomes. D) dominant. E) linked.