Bacteria in the colon protect people from some infections.?
Indicate whether the statement is true or false.
Answer: True
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Researchers use HeLa cells to
a. study cancer. b. study viral growth. c. perform protein synthesis. d. study the effects of radiation. e. do all of these.
Radiometric dating ____.
A. is based on the premise that each isotope decays at a constant rate B. is unpredictable because of changes in temperature and pressure C. can be used to date sedimentary rock, but not fossils D. has a substantial error factor E. can only be used for dating animal fossils
Which of the following diseases is a major problem for AIDS patients?
A) Chagas' disease B) toxoplasmosis C) hemorrhagic fevers D) Lyme disease E) brucellosis
The efficiency of energy transfer between trophic-levels averages about
A. 33%. B. 10%. C. 1%. D. 25%. E. 0.1%.