According to studies by Norman Terry and coworkers, some plants can perform a version of
bioremediation of selenium in wastewater by
a. converting selenium to a form that kills waterfowl.
b. using selenium to make a necessary supplement for humans.
c. converting selenium into a relatively nontoxic gas.
d. storing selenium in the soil.
e. increasing the selenium concentration in the water.
C
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In vertebrates, DNA methylation - the addition of a methyl group to DNA nucleotides - ensures that
A. the gene functions without interruption. B. no errors will be made during transcription. C. the nucleosome will quickly form, which assists in mRNA formation. D. once that gene is transcribed, the mRNA is saved and used over and over again. E. once a gene is turned off, it will remain off.
Viral meningitis normally requires aggressive antiviral treatment.
Answer the following statement true (T) or false (F)
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. Test the cells to see if they can grow on media to which penicillin has been added. B. Perform an antibiotic susceptibility test on the cells using antibiotics other than penicillin that are known to be effective. C. Set up an Ames test to see if any of the isolates are mutagenic. D. Determine whether or not wild type cells of the same bacterial species are susceptible to penicillin.
What term is used to describe bone cells?
A. osteocytes B. trabeculae C. chondrocytes D. periosteum E. epiphysis