Which hypothesis suggests that organic molecules formed near Earth's surface in pools of water?
a. clay hypothesis
b. iron-clay hypothesis
c. organic broth hypothesis
d. prebiotic soup hypothesis
e. iron-sulfur world hypothesis
d
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Which of the following is not a common way signals are relayed between cells?
A. Contact-dependent signaling B. Autocrine signaling C. Direct intercellular signaling D. Paracrine signaling E. All of the above are ways signals are relayed between cells
Type ________ hypersensitivity involves delayed, cell-mediated immune reactions.
A. I B. II C. IV D. III
Most of the oxygen in the blood is transported
A) by white blood cells. B) in the plasma. C) as bicarbonate ions. D) bound to hemoglobin. E) combined with carbon dioxide.
Which of the following statements is not true of protists?
A. Moisture is absolutely essential to their existence. B. They make up a substantial fraction of the marine plankton. C. They are not known to cause diseases of humans. D. Most are free-living.