All of the different kinds of interacting organisms living within a certain area make up a(n)
A. ecosystem.
B. species.
C. community.
D. population.
Answer: C
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Active -galactosidase enzyme is observed only in E. coli growing in the presence of lactose. One hypothesis is that the enzyme is always being produced, but is produced in an unstable form that breaks down rapidly in the absence of lactose (hypothesis 1)
A second hypothesis is that the enzyme is stable, but is produced only in the presence of lactose (hypothesis 2). An experiment was performed to test these hypotheses. A culture of growing cells was exposed to lactose, which was later removed. The amount of -galactosidase present in the culture during the course of the experiment was measured. The data are shown in the graph below. Which one of the following statements is a conclusion that can be obtained from these experimental data? A. The amount of -galactosidase in the culture decreased rapidly after lactose was removed, in support of hypothesis 2. B. The amount of -galactosidase in the culture decreased rapidly after lactose was removed, in support of hypothesis 1. C. The amount of -galactosidase in the culture remained stable after lactose was removed, in support of hypothesis 1. D. Synthesis of -galactosidase is turned on when lactose is added and turned off when lactose is removed, in support of hypothesis 2. E. Synthesis of -galactosidase is turned on when lactose is added and turned off when lactose is removed, in support of hypothesis 1.
The specimen of choice for detecting tuberculous pulmonary mycobacterial disease is:
a. spontaneously produced sputum. b. gastric lavage. c. transtracheal aspiration. d. bronchoscopy.
In reptiles, the circulatory system of the lungs is nearly completely separate from the circulatory system of the rest of the body
Indicate whether the statement is true or false
Woodpeckers, insects, bacteria, hawks, and raccoons are found to reside in the same forest. Studies of the interactions between these organisms would be at the level of a
A) community. B) species. C) biosphere. D) population. E) niche.