What is the site of nitrogen fixation in legumes?
a. mycorrhizae
b. root nodules
c. phloem
d. the cortex
e. the pith
B
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An infection in which the virus is continually present in the body is referred to as
A. acute. B. balanced. C. determinant. D. persistent.
The large, rigid layers of Earth's surface that are moving in response to forces deep within Earth, are called
A. petrifactions. B. Wallace's lines. C. radioisotopes. D. paleontologic units. E. tectonic plates.
The condition that is characterized by the wearing-down of joints due to insufficient cartilage repair is called:a
osteitis. b. osteoporosis. c. osteopenia. d. osteoarthritis. e. osteon disease.
Which mechanism of nutrient acquisition is not seen in bacteria?
A. Group translocation B. Active transport C. Endocytosis D. Simple diffusion E. Facilitated diffusion