The transfer of electrons from glucose to oxygen during aerobic respiration takes place in a stepwise
fashion through a number of intermediates rather than by direct transfer. This is because:a.
it is chemically impossible to transfer electrons directly from glucose to oxygen.
b. the chemical intermediates donate some of their electrons in order to increase the electron
pool.
c. the energy of the electrons can be used to make ADP.
d. the energy of the electrons can be used to make ATP.
e. the energy of the protons can be used to make ATP.
D
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The fewer muscle fibers present in a motor unit:
A. the weaker the contractions of muscle fibers in that motor unit. B. the greater the control over the movement(s) that result from stimulation of that motor unit. C. the less likely an action potential will be generated in the muscle fibers of that motor unit. D. the less likely these muscle fibers will fatigue.
With which of the following chemicals do
white blood cells communicate with each other?
a. complement proteins b. cytokine c. hydrogen peroxide d. methicillin e. lysozyme
The effectiveness of geographic barriers in
promoting speciation is related most to a. the size of the barrier. b. the inability of the organisms to overcome the barrier. c. the speed at which the barrier forms. d. how long the barrier exists. e. the size of the population it separates.
Redness, swelling, heat, and pain of an infection are a result of the adaptive immune response
a. True b. False