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
White blood cells that engulf a microorganism and then explode their contents, creating a net that traps and kills
pathogens are known as ____.
a. neutrophils b. macrophages c. B lymphocytes d. dendritic cells e. eosinophils
Reproductive isolation often occurs due to
a. geographic separation. b. species incompatibility. c. mutation. d. genetic drift. e. natural selection.
The ability to control these processes may allow manipulation of an organism's cells or insertion of cells into an organism to allow the regrowth of damaged tissues and organs in humans.
A. vector and somatic cell transformation B. mitosis and meiosis C. determination and differentiation D. transformation and transduction