Which answer best describes energy flow in biological systems as described in the text?
a. glucose ? G3P ? NADH ? ATP
b. bacteria ? archaea ? plants ? animals
c. NAD+ ? NADH ? ADP ? ATP
d. G3P ? glucose ? ATP ? NAD+
e. pyruvate oxidation ? glycolysis ? fermentation ? citric acid cycle
A
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A population growth pattern that reaches a certain level is described with a(n)
a. logarithmic equation. b. exponential equation. c. logistic equation. d. J -shaped curve. e. quadratic equation.
Why does the process of making biofuels from weeds and other plant matter require additional steps?
a. They contain a higher proportion of cellulose than corn, soy or sugarcane. b. They contain a lower proportion of cellulose than corn, soy or sugarcane. c. They contain a higher proportion of starch than corn, soy or sugarcane. d. They contain a higher proportion of ethanol than corn, soy or sugarcane. e. They contain a lower proportion of ethanol than corn, soy or sugarcane.
By the eighth week in humans
a. the embryo looks distinctly human. b. the neural tube is complete. c. upper and lower limbs have formed, and individual fingers and toes have separated from each other. d. male or female reproductive structures are forming. e. all of these are true.
When sodium chloride dissolves in water, the sodium and chloride ions are pulled into solution by:
A) the attraction of the sodium ions to the positively charged oxygen, and the attraction of the chloride ions to the two negatively charged hydrogens of the water molecules. B) covalent bonds that form between the ions and the water molecules. C) ionic bonds that form between the ions and the water molecules. D) the attraction of the sodium ions to the negatively charged oxygen, and the attraction of the chloride ions to the two positively charged hydrogens of the water molecules.