In humans, ventilation is powered by the
1.diaphragm only.
2.muscles attached to the ribs only.
3.lungs, themselves.
4.diaphragm and rib muscles.
5.all of the choices
4
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Biochemistry is based on the chemistry of which element?
a. hydrogen b. oxygen c. carbon d. sulfur
Evolutionary trees are constructed using all of the following except:
A. similarities in the physical structure of organisms. B. similarities in the embryological development of organisms. C. similarities in the DNA sequences of organisms. D. tissue samples.
Which of the following reactions is performed by yeast in wine-making?
A) sugar ? ethanol B) ethanol ? acetic acid C) malic acid ? lactic acid D) carbon dioxide ? sucrose E) sugar ? CO2 + H2O
During photosynthesis, visible light has enough energy to:
A) convert ADP into ATP. B) synthesize NADPH. C) split a water molecule into hydrogen and oxygen. D) excite electrons. E) reflect light in the red spectrum.