What is the term for similar cells that are organized together with a common function?
a. organ
b. interstitial organization
c. tissue
d. organism
e. extracellular matrix
ANSWER: c
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A 26-year-old woman who has a Gardnerella vaginalis infection becomes immunocompromised, which causes the organism to enter the bloodstream. She has several fever spikes; therefore blood cultures are drawn and placed in blood culture media containing sodium polyanethol sulfonate (SPS). After 5 days of incubation, the blood cultures are negative. Which of the following statements explains this
discrepancy? a. G. vaginalis stays localized in the female genital tract and does not enter the blood-stream. b. The blood culture media is most likely expired. c. The automated blood culture system is most likely not correctly functioning. d. G. vaginalis is usually inhibited by this anticoagulant, making recovery difficult.
A direct immunofluorescence test involves a(n)
A. known antibody binding to an unknown antigen. B. lysis reaction. C. agglutination reaction. D. precipitation reaction.
In the bacterial nitrogen economy, is any group(plant,symbiotic nitrogen-fixing bacteria) working for free?
If in male fruit flies, crossing-over does not occur during meiosis, while in females crossing-over does occur
A. there is less genetic variety among sperm than among eggs. B. fewer sperm are produced than eggs. C. males are not necessary for fertilization in fruit flies. D. more female offspring will be produced than male offspring.