Escherichia coli has not been found to be pathogenic in humans.
Answer the following statement true (T) or false (F)
False
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The photosynthetic amoeba is an example of a second chloroplast endosymbiotic event
A. true B. false
The time it requires for exactly one-half of a given amount of a radioactive isotope of an element to decay is called that isotope's
A. decay time. B. decay product. C. half-life. D. half-decay. E. useful dating range.
Despite advances in microscopy during the late 1800s and early 1900s, experiments using bacteria as test subjects required careful precautions to prevent contamination that would have invalidated results. What advantage did bacteria have over other, larger organisms that could be used as test subjects, such as mice and pea plants?
a. Larger organisms used as test subjects are more susceptible to injury and disease. b. Bacteria do not require specialized equipment to be stored and transported like other test subjects. c. Bacteria reproduce rapidly, allowing experiments to be conducted and repeated more often. d. Unlike mice and pea plants, bacteria can be frozen for display without cellular damage.
Which of the following is (are) responsible for the
movement of nutrients upstream? a. migratory fish and other animals b. phytoplankton c. bacteria d. leaching e. all of these