Most microorganisms maintain their internal pH
A. near neutral (pH 7).
B. slightly alkaline (pH 8-10).
C. near their optimum growth pH.
D. slightly acidic (pH 4-6).
Answer: A
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Spontaneous generation _____
A) was demonstrated to occur under normal laboratory conditions by Pasteur B) apparently occurred at least onceâ€"when life on Earth began C) occurs every time a new species evolves from a preexisting species D) addresses the formation of new cells from existing cells
What is the difference between a primary and a secondary source?
A. A primary source is the raw data before scientists publish, whereas a secondary source is a description of the original material. B. A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material. C. A primary source is the original material published by the scientists, whereas a secondary source is the raw data before scientists publish. D. There is no difference between primary and secondary sources.
After making careful observations, scientist construct a(n)
A. scientific method B. hypothesis C. cohort D. research question
Energy has discrete pockets called
A) wavelengths B) photons C) electro-magnetic spectrum D) pigments