Which of the following is required for composting?
A) addition of non-biodegradable materials
B) addition of nitrogen and phosphorus sources
C) periodic turning or raking of the compost pile
D) addition of thermophilic microbes
E) constant anaerobic conditions
C
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The movement of both oxygen and carbon dioxide in the body is accomplished by:
a. exocytosis and endocytosis b. bulk flow c. osmosis d. diffusion e. facilitated diffusion
One line of evidence that humans arose in Africa is the observation that Africans have
A. the most diverse mitochondrial DNA sequences. B. rRNA sequences that place them in the domain Archaea. C. fewer genes. D. slower molecular clocks. E. the most diverse nuclear DNA sequences.
How long have prokaryotes lived on Earth?
What will be an ideal response?
C4 plants have better water conservation abilities than do many other plants (especially C3). This is because:
a) C3 plants are able to keep their stomata closed during the day. b) C4 plants have smaller stomata that are protected by hairs and pits. c) C4 plants open their stomata at night. d) C4 plants have no leaves, they use their stems for photosynthesis. e) C4 plants have the ability to obtain CO2 without opening their stomata.