Leaching is caused by
a. bacterial action.
b. wind.
c. water.
d. microbial activity.
e. none of these.
Answer: c
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Which of the following is the major reason why it has been difficult to treat viral infections with chemotherapeutic agents?
A. Viruses use the metabolic machinery of their hosts, which limits many of the potential points of attack. B. Viruses have no metabolism and therefore offer no selective point of attack. C. Viral metabolism resembles that of their hosts so there is no selective point of attack. D. Actually, viruses are not difficult to treat with chemotherapeutic agents.
During a study session about evolution, one of your fellow students remarks, "The giraffe stretched its neck while reaching for higher leaves; its offspring inherited longer necks as a result." Which statement is most likely to be helpful in correcting this student's misconception?
A. Disuse of an organ may lead to its eventual disappearance. B. Only favorable adaptations have survival value. C. If the giraffes did not have to compete with each other, longer necks would not have been passed on to the next generation. D. Characteristics acquired during an organism's life are generally not passed on through genes. E. Spontaneous mutations can result in the appearance of new traits.
Redness, swelling, heat, and pain of an infection are a result of the adaptive immune response. Indicate whether the statement is true or false
In an aqueous environment, how are the phospholipids of a membrane arranged?
a. in a single layer b. in a bilayer, with the fatty acid tails located at the surface c. in a bilayer, but the phospholipids have no specific orientation d. in a bilayer, with the polar heads of each layer located at the surface