The fungus Pneumocystis jiroveci is found in the lungs of most people in low numbers, but in immunocompromised people it overgrows, resulting in severe respiratory problems. The fungus is best described as
A) a parasite.
B) resident microbiota.
C) a mutualist symbiotic partner.
D) transient microbiota.
E) both resident microbiota and opportunistic pathogen.
E
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All of the following are true about plasmids EXCEPT:
a. Plasmids are small portions of circular DNA found in bacteria. b. Plasmids often encode for genes that carry toxins or antibiotic resistance. c. Plasmids can be transferred from one bacterium to another. d. Plasmids contain DNA and are found in the nucleoid region of bacteria
The organism shown above is using which of
the following types of reproduction? a. asexual budding b. sexual production of eggs c. hermaphroditic co-fertilization d. a combination of all three e. none of these
The Hardy-Weinberg principle shows that if the population is large, inheritance alone does not cause changes in allele
frequency. _______ Indicate whether the statement is true or false.
A biologist discovers a new species of organism adapted to living in a deep underground cavern that provides no source of free water. The organism is eyeless and covered by fur, and it has a four chambered heart with a closed circulatory system. What excretory system adaptations to this extreme environment might the biologist expect to find?
A. Nephrons with long loops of Henle B. Very short malpighian tubules C. Very long malpighian tubules D. Nephrons with short loops of Henle E. Metanephridia with a large number of nephridiopores