Which of the following is not correct concerning the plague?
A) Less than 10 cases per year occur in the U.S.
B) Mice, voles, and other rodents are primary long-term reservoirs.
C) Strains of the plague bacillus are less virulent today compared to strains prevalent in the Middle Ages.
D) The etiological agent is Yersinia pestis.
E) It is transmitted by flea vectors.
C) Strains of the plague bacillus are less virulent today compared to strains prevalent in the Middle Ages.
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Nonpolar hormones can pass through the intestinal cell membrane without being digested, and therefore can be taken orally. Which of the following hormones are available as pills?
A. insulin and growth hormone B. thyroid hormone and steroid hormones C. calcitonin and insulin D. insulin and steroid hormones E. calcitonin and thyroid hormone
The length of day is ____ apt to change and the sunlight is ____ near the equator
a. less; strongest b. less; weakest c. more; strongest d. more; weakest e. equally; constant
Which of the following states that changes in species composition are orderly and predictable during succession?
1.The facilitation hypothesis
2.The inhibition hypothesis
3.The tolerance hypothesis
Juan has influenza and has aches, pains, and a fever. His mother, a physician, tells him to take an antipyretic. What is she telling him to take?
A. an antihistamine B. acetaminophen, like tylenol C. herbal tea with honey D. an antiviral drug, like tamiflu E. an antibiotic, like erythromycin