The process by which bacteria and fungi break down
nitrogenous materials forming NH4+ is
a. nitrification.
b. ammonification.
c. denitrification.
d. nitrogen fixation.
e. respiration.
Answer: b
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Which of the following statements about joints is false?
A. A hinge joint can be controlled by two antagonist muscles, whereas ball and socket joints require at least four sets of muscle antagonists. B. The shoulder is the most mobile joint in the human body. C. A ball-and-socket joint is less stable than a hinge joint. D. Ball-and-socket joints allow motion along three axes, whereas hinge joints limit motion to one axis of rotation. E. The range of motion of a joint is determined by the shapes of the bone surfaces that meet at the joint.
Which of the following would NOT be included in the reaction chamber of an experiment intended to
duplicate the atmosphere of ancient earth? a. carbon dioxide b. hydrogen gas c. carbon monoxide d. water vapor e. nitrogen gas
_______ is a disease characterized by high transmissibility and low virulence.
A. bubonic plague B. AIDS C. chicken pox D. two of the above
The cell type that breaks down fibrous connective tissue is termed __________________?
Fill in the blank(s) with the appropriate word(s).