What is NOT a result or an effect of irrigation?
a. increased food production
b. saltwater intrusion into water supplies
c. lowered water tables
d. uplifted land
e. salinization
ANSWER: d
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Sometimes a prokaryotic activator protein interacts with a small molecule in the cell and undergoes a change in shape that alters its affinity for binding to DNA. This change in shape is an example of an ____ effect
Fill in the blank with the appropriate word.
A public health microbiologist plans to screen a particular bacterial species that was isolated from several patients in an intensive care unit to detect if any of the cells are penicillin-resistant mutants. What is the first step in conducting this experiment?
A. Set up an Ames test to see if any of the isolates are mutagenic. B. Determine whether or not wild type cells of the same bacterial species are susceptible to penicillin. C. Test the cells to see if they can grow on media to which penicillin has been added. D. Perform an antibiotic susceptibility test on the cells using antibiotics other than penicillin that are known to be effective.
These two categories of specialized cells are called
The two broad classes of cells in the nervous system include 1.) those responsible for information processing, and 2.) those providing mechanical and metabolic support A. microglia and Schwann cells. B. neurons and glial cells. C. Schwann cells and glial cells. D. neurons and fibrocytes. E. astrocytes and Schwann cells.
Blood entering the fetal pulmonary artery bypasses the lungs through the ____
a. umbilical arteries b. umbilical veins c. ductus venosus d. foramen ovale e. ductus arteriosus