The pH scale is a direct measure of the concentration of:
A) hydrogen ions in a solution.
B) hydroxide ions in a solution.
C) hydrogen atoms in a solution.
D) salt in a solution.
E) buffers in a solution.
A) hydrogen ions in a solution.
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Recall from the text the example of cell communication in Streptococcus pneumoniae: the rate of DNA uptake by pneumococcal cells increases sharply when they are at high density due to changes in gene expression brought about by signaling between cells
If the pneumococcal cells did not express receptor protein, how would the rate of DNA uptake be affected when the cells reach high density? A. There would be no change in the rate of DNA uptake. B. There would be a larger than normal increase in the rate of DNA uptake. C. There would be a smaller than normal increase in the rate of DNA uptake. D. There would be a decrease in the rate of DNA uptake.
Communities of organisms are made up of:
a. populations of different species. b. different habitats. c. two or more populations of the same species. d. ecosystems. e. interacting niches.
A ________ tide occurs when the Moon and Sun are at right angles to the Earth
A) low B) high C) spring D) neap
When oxygen is present in the environment, methylene blue is ______.
A) blue B) colorless