Most nitrogen-fixing bacteria symbiotically associated with plants are called
A) bacteroids.
B) mycorrhizae.
C) rhizobia.
D) symbiodinia.
Answer: C
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Ultimate source of all cells that contribute to growth in length of stem or root.
Choose the letter of the best match: A. protoderm B. vascular cambium C. apical meristem D. procambium E. ground meristem
Chyme is first formed in the
a. mouth. b. esophagus. c. stomach. d. small intestine. e. large intestine.
In a graphical representation of an organism's population growth in a given habitat, the growth rate for an organism whose population is increasing according to its biotic potential is best represented by a(n)
A) line with a negative slope. B) S-shaped curve. C) flat line (no slope) set at the carrying capacity of the environment. D) exponential growth curve. E) flat line (no slope) set at the equilibrium point of environmental resistance versus biotic growth potential.
The figure below shows results of bristle number in Drosophila flies after 35 generations of artificial selection. This figure suggests that
A. natural selection cannot lead to large phenotypic changes. B. after 35 generations of selection, populations no longer exhibit variation in bristle number. C. bristle number has evolved beyond the original range of phenotypic variation for this trait. D. at the end of the experiment, "high population" flies were unable to interbreed with "low population" flies.