The Staphylococcus aureus bacteria shown in the image below form biofilms in medical equipment. Bacteria such as this use quorum sensing to delay the production of toxins until the colony has reached a specific size. What advantage does this have over producing toxins immediately?
a. The toxins produced by bacterial biofilms are polymer chains that cannot be synthesized within individual bacteria.
b. Bacteria require the additional time to develop immunity against the toxins they release, which are otherwise fatal.
c. Quorum sensing ensures that the colony can remain undetected until it is large enough to damage or destroy its host.
d. Biofilms are capable of rudimentary intelligence via neural networking behavior when sufficient bacteria are present.
c. Quorum sensing ensures that the colony can remain undetected until it is large enough to damage or destroy its host.
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Indicate whether the statement is true or false.
P. vivax is suspected in a patient who has been traveling for months in the tropics. Blood was collected in a lavender top tube; however, the slide was not prepared for examination until the next day because the specimen came in on the night shift. Once the slide was prepared and ex-amined, Schüffner dots were not visible. Which one of the following statements explains this discrepancy?
a. Schüffner dots are not characteristic of P. vivax infections. b. The blood film was most likely incorrectly prepared. c. The blood should have been collected in a red top tube. d. The blood remained in the tube too long, yielding false-negative results.
If a person has fully functional eyes, except for the absence of a lens, they would ____
a. be totally blind b. be able to perceive light and even respond to different light intensities c. be able to perceive light and even colors (solid color over a large area), but not details d. be able to see some details and read print, but only if the text were written in large, black letters e. have normal vision if given glasses
If you were describing to a class of nursing students how the polio vaccine, which contains inactivated virus, works
A. introduce antibodies into a person. B. create immunological memory without causing disease. C. introduce synthetic drugs, like sulfa drugs, into a person. D. give a person a mild disease. E. stimulate the production of blood platelets.