When a chemotherapeutic agent is effective against many different pathogens including both Gram-positive and Gram-negative bacteria, it is said to be a ________ antibiotic.
What will be an ideal response?
broad-spectrum
broad spectrum
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A land developer and several ecologists are discussing how a parcel of private land should be developed while saving twenty hectares as natural habitat
The land developer suggests that the twenty hectares be divided into twenty separate one-hectare areas. The ecologists suggest that it would be better to have one intact parcel of twenty hectares. What is the significance of these different arrangements of the twenty hectares? A) There really is no difference; they should both work equally well. B) The isolated hectare plots increase the ability of individuals to disperse from one habitat to another. C) The isolated plots are more vulnerable to edge effects. D) The large plot will create more inbreeding in many species.
The information from messenger RNA is used
to create polypeptide sequences during the process of
a. transduction. b. transcription. c. transformation. d. translation. e. transreification
The area covered by tropical rain forest is reduced by millions of hectares per year due to agriculture and logging. Which of the following best describes a likely result of tropical rain forest deforestation?
(A) Populations of plants and animals will decrease as more rain forest disappears, leading to a decrease in biodiversity. (B) An increase of soil moisture will lead to a rapid increase in new vegetation coverage. (C) An increase in atmospheric carbon dioxide will lead to higher levels of ultraviolet radiation reaching the surface of Earth. (D) More oxygen will be available to other organisms as plant numbers decrease.
The initial, brief period of early, general symptoms such as fatigue and muscle aches, is the
A. period of invasion. B. prodromal stage. C. convalescent stage. D. incubation period. E. All of these choices are correct.