Which of the following is not correct concerning the plague?
A. Mice, voles and other rodents are primary long-term reservoirs.
B. Strains of the plague bacillus are less virulent today as in the Middle Ages
C. It is transmitted by flea vectors.
D. Less than 10 cases per year occur in the US.
E. The etiological agent is Yersinia pestis
Answer: B. Strains of the plague bacillus are less virulent today as in the Middle Ages
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A structure called a(n) _______ allows the transfer of genetic information during conjugation
A. F factor B. plasmid C. sex pilus D. transformation bridge
Mutations are ____
a. always bad for populations b. always good for populations c. always harmful for individuals d. the basis of homogeneity in a population e. the basis of variability among individuals
What is the exchange of gases between the atmosphere and the blood through the alveoli called?
a) external respiration b) internal respiration c) inhalation d) cellular respiration
Helicobacter pylori can survive the acidic conditions of the human stomach and have been found to cause the development of stomach ________
Fill in the blank(s) with correct word