The two broad classes of cells in the nervous system include 1. those responsible for information processing, and 2. those providing mechanical and metabolic support.These two categories of specialized cells are called
A. microglia and Schwann cells.
B. Schwann cells and glial cells.
C. neurons and glial cells.
D. neurons and fibrocytes.
E. astrocytes and Schwann cells.
Answer: C
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If a trait has a large inherited component, then concordance among monozygotic twins will be
A) considerably higher than that of dizygotic twins. B) considerably lower than that of dizygotic twins. C) about the same as that of dizygotic twins. D) 100%.
The ultimate source of energy trapped during photosynthesis is
a. CO2. b. H2O. c. O2. d. sunlight.
Solar radiation in December is greatest at
A) the equator. B) the Tropic of Cancer. C) 90° in the Southern Hemisphere. D) 90° in the Northern Hemisphere.
Suppose you use a dissecting microscope to observe organisms that have colonized discs of densely packed, fibrous wood (Masonite plates) that have been submerged in 6 inches of lake water for 8 weeks. You see insect cases (protective shelters), insect
larvae, and newly emerged insects with wings. You determine that you are looking at an insect species A) that undergoes incomplete metamorphosis. B) that undergoes complete metamorphosis. C) with a body plan of radial symmetry. D) with incomplete digestive tracts.