The habitats most favorable for the growth of legumes in symbiosis with nitrogen-fixing bacteria are
A. potassium-poor soils.
B. phosphorus-poor soils.
C. manganese-poor soils.
D. calcium-poor soils.
E. nitrogen-poor soils.
E. nitrogen-poor soils.
Rhizobium bacteria develop mutualistic symbiotic relationships with plants in nitrogen-poor soils. The bacteria fix nitrogen for the plants in exchange for carbohydrates and oxygen.
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Graded potentials are particularly important for conveying stimulus intensity in
A. sensory neurons. B. motor neurons. C. interneurons. D. skeletal muscle cells. E. Schwann cells.
Unlike most animals, humans engage in sexual intercourse for pleasure as much or more than for the purpose of reproduction
The process of intercourse is characterized by several phases designed to heighten the arousal, excitement, and/or pleasure associated with contact with a partner. If a man or woman was not easily aroused, or even could not be, is sperm transfer to a woman possible, and in turn, is it possible for fertilization to occur?
A small mass of specialized muscle on the back wall of the right atrium, also known as the pacemaker, is medically known as what?
A) atrioventricular node B) cardiopulmonary node C) bundle of His D) sinoatrial node
Which of the following small intestine cells secretes lysozyme?
a) Goblet cells b) Absorptive cells c) Mucosa cells d) Paneth cells e) S cells