The greatest amount of nutrient absorption takes
place in the
a. stomach.
b. small intestine.
c. colon.
d. pancreas.
e. esophagus.
Answer: b
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Constipation can be caused by
a. emotional stress. b. a low-fiber diet. c. a sedentary lifestyle. d. dehydration. e. all of these.
Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth
Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it? A) How can amino acids, simple sugars, and nucleotides be synthesized abiotically? B) How did RNA sequences come to carry the code for amino acid sequences? C) How could polymers involving lipids and/or proteins form membranes in aqueous environments? D) How can RNA molecules act as templates for the synthesis of complementary RNA molecules?
Which of the following is a common feature of both sets of reactions represented by A and B in the figure?
a. Both include steps involving the hydrolysis of organic molecules.
b. Both include steps involving the oxidation of organic molecules.
c. Both sets of reactions occur within the mitochondria.
d. Both include steps involving reactions that result in the release of carbon dioxide.
Which of the following are phagocytic cells descended from monocytes?
A) alveolar macrophages B) dendritic cells C) microglial cells D) alveolar macrophages and dendritic cells E) alveolar macrophages and microglial cells