Uterine contractions ____
a. often occur during the second trimester
b. are controlled by negative feedback
c. are controlled by positive feedback
d. are stimulated by the hormone prolactin
e. only occur during the first two stages of labor
ANSWER: c
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The hydrogen ion gradient across the thylakoid membrane is required to ________________
What will be an ideal response?
A child swinging on a swing utilizes which type(s) of energy?
a. kinetic energy only because the child is in constant motion b. potential energy only, because the child has to invest energy to get the swing to move c. chemical energy only, because it is the child's metabolism that powers the muscles that make the swing move d. kinetic and potential energy only, but in constantly changing ratios: when changing direction it is pure potential energy; at the bottom of the arc, it is pure kinetic energy e. kinetic, potential, and chemical energy: the child powers the swing with chemical energy in the muscle, cells and the swing moves like a pendulum with changing ratios of kinetic and potential energy.
The type of reproductive isolation in which the two populations are separated due to their habitat is
A. mechanical isolation. B. behavioral isolation. C. hybrid inviability. D. temporal isolation. E. ecological isolation.
Pathogenicity The organisms of botulism, tetanus, and diphtheria are distinguished by their
A. Production of spores B. Chemotaxis C. Ability to produce coagulase D. Growth in anaerobic environments E. Production of exotoxins