The fermentation by-products of Clostridium perfringens can destroy muscle structure in myonecrosis.
a. true
b. false
Answer: a. true
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Localized areas of destruction occurring on plants that have been infected by a virus are referred to as ________ lesions.
Fill in the blank(s) with the appropriate word(s).
Guard cells control their volume, and thus size:
A. by increasing the amount of solutes such as K+ and Cl-. B. by reducing the amount of solutes such as K+ and Cl-. C. by increasing the amount of water in the cells without changing solute concentration. D. by decreasing the amount of water in the cells without changing solute concentration. E. by increasing the amount of CO2 in the cells.
Which of the following statements is false?
a. The information that travels along the neural membrane is little more than a transient change in the membrane potential. b. A neuron is never really at rest but must expend energy to keep the membrane potential constant even when no impulse is being transmitted. c. During the short time an action potential occurs, the cytoplasmic side of the membrane becomes positive with respect to the outside. d. Only nerve cells can exhibit depolarization events. e. Action potentials are not directly transferred from neuron to neuron.
Which of the following choices CORRECTLY ranks by the routes of water loss from largest source of water loss to smallest source of water loss, by their average volume?
A. urine, skin, feces, lungs B. urine, skin, lungs, feces, C. urine, feces, skin, lungs D. skin, urine, lungs, feces