Some microbes can (assimilate/oxidize/reduce) hydrogen sulfide to elemental sulfur.
Fill in the blank(s) with the appropriate word(s).
oxidize
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You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Because the wound was made by a rusty nail, you are concerned about infection by Clostridium tetani bacteria, which cause tetanus
You are relieved to see that the patient received a tetanus vaccine at her last checkup. The vaccine ____________. A. exposed the patient to C. tetani so that she contracted a mild version of tetanus. B. exposed the patient to deactivated C. tetani, so that her B cells would produce antibodies to the bacteria with minimal risk of contracting the disease. C. stimulated the production of mast cells by her bone marrow. D. exposed the patient to other types of bacteria, so that her immune system would be prepared for infection by prokaryotes.
Methicillin inhibits cell wall production. Why does this make it an effective antibiotic?
a. The cell wall of human cells is not sensitive to methicillin b. Human cells have a plasma membrane in addition to the cell wall that allows them to survive in the presence of methicillin c. Human cells do not have cell walls d. All humans have a gene giving methicillin resistance e. Human cells and bacterial cells are completely different, so methicillin does not affect human cells
Species that exhibit repeated reproductive cycles are said to be semelparous
____________________ Indicate whether the statement is true or false.
Cells that are not acid fast appear ________ after the acid-alcohol step in the acid-fast staining process.
A) Red B) Clear C) Blue