Which of the following statements about oxygen is false?
a. Only the oxidation of organic molecules by O2 provides sufficient energy to support large, active organisms.
b. Oxygen is the only potential electron acceptor available on Earth's surface.
c. Oxygen is necessary for complex multicellular life.
d. Oxygen concentrations in the atmosphere favor diffusion into the interior cells of organisms.
e. Oxygen became abundant in the atmosphere 580-560 million years ago.
Ans: b. Oxygen is the only potential electron acceptor available on Earth's surface.
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Stomatal closure is passive because ______________
A. K+ and Cl- diffuse from high to low concentration B. water diffuses from low to high concentration C. ATP is required D. it conserves leaf hydration
Reproductive isolation often occurs due to
a. geographic separation. b. species incompatibility. c. mutation. d. genetic drift. e. natural selection.
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pathogens are known as ____.
a. neutrophils b. macrophages c. B lymphocytes d. dendritic cells e. eosinophils