The most common etiologic agent of septic arthritis in adults younger than 30 years of age is:
a. Neisseria gonorrhoeae.
b. Staphylococcus aureus.
c. Haemophilus influenzae.
d. Streptococcus agalactiae.
A
Overall, S. aureus is the most common etiologic agent of septic arthritis, accounting for approx-imately 70% of all such infections. In adults younger than 30 years of age, however, N. gonorr-hoeae is isolated most frequently.
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One of the ways agricultural production of such fruits as tomatoes or cucumbers can be increased significantly is to grow them in:
A. soils rich in magnesium B. soils rich in nitrogen C. greenhouses supplied with extra carbon dioxide D. greenhouses with extra oxygen E. None of these is true
For statements 117–121 select the best choice of the four
evolutionary processes listed below. a. mutation b. gene flow c. genetic drift d. natural selection M 117. This is most likely to lead to the loss of genetic variation in a small population. E 118. This process produces new genetic variation within a species. M 119. This process can rapidly offset the effects of genetic isolation when two populations come into secondary contact. M 120. The reduced contribution of one phenotype in comparison to another to the next generation is an example of this. M 121. The occurrence of mimicry is best explained as the ultimate result of this process.
The number of which subatomic particle designates the atomic number of an element?
A) electrons B) neutrons C) protons D) protons plus neutrons
A DNA element that decreases transcription of a gene from a vast distance is known as a(n)
A) insulator. B) TATA box. C) regulator. D) proximal control element. E) silencer.