Which of the following statements about Pneumocystis jiroveci is true?
A. The organism and the disease remains localized in the lungs even in fatal cases.
B. The disease it causes occurs almost exclusively in immunocompromised hosts.
C. It causes the alveoli to fill with a frothy exudate.
D. All of the choices are correct.
Answer: D
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________ immunity is an epidemiological concept that explains the resistance of a population to infection and the spread of an infectious organism due to the immunity of a high percentage of the population.
A. Innate B. Experimental C. Herd D. Natural
A _____ is a small circle of bacterial DNA that contains a few genes and is separate from the chromosome
a. plasmid b. chromosome c. nucleus d. double helix
A male gamete is called a(n) __________ and a female gamete is called a(n) __________.
Fill in the blank(s) with the appropriate word(s).
Which of the following items provides an incorrect match between genetic and cultural evolution?
a. allele = form of a cultural trait b. genetic inheritance = cultural transmission c. linkage = correlation between cultural traits d. genetic drift = rapid spread of cultural trait