Which of the following statements concerning the phosphorus cycle in bacteria is TRUE?
A. The element cycles between different organic molecules.
B. It is the most important process for synthesizing proteins and nucleic acids.
C. The element alternates among several oxidative states.
D. The element changes from insoluble to soluble forms.
E. The element is converted to a gaseous state and is lost to the environment.
Answer: D
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. The compost pile temperature at which pathogens, but not thermophiles, are killed is about 20-30ºC
Indicate whether this statement is TRUE or FALSE.
In lab, you are studying the long term effects of elevated carbon dioxide levels on photosynthesis in C3 and C4 plants. The C3 and C4 plants are growing in separate closed chambers. Both chambers are constantly given elevated but equal amounts of carbon dioixde. Which of the following are likely results of this experiment? Check all that apply.
_____ There would be a decrease in O2 levels in both chambers. _____ There would be an increase in O2 levels in both containers. _____ Both the C3 and the C4 plants would show equal gains in biomass. _____ The C4 plants would gain more biomass relative to the C3 plants. _____ The C3 plants would gain more biomass relative to the C4 plants.
Before leaving the nucleus, the RNA molecule
a. acquires a poly-A tail. b. is released from the STOP signal on the template. c. becomes capped. d. is stripped of its introns. e. does all of these.
During which phase does the nuclear envelope begin to break down?
a. prophase b. metaphase c. prometaphase d. telophase e. cytokinesis