Symptoms of protozoan and helminthic diseases are due to
A) tissue damage due to growth of the parasite on the tissues.
B) waste products excreted by the parasite.
C) products released from damaged tissues.
D) tissue damage due to growth of the parasite on the tissues and waste products excreted by the parasite.
E) tissue damage due to growth of the parasite on the tissues, waste products excreted by the parasite, and products released from damaged tissues.
E
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Which statement makes a prediction for the hypothesis "bird species have decreased in number in a particular wetland due to construction traffic"?
A) If a wetland area is disturbed by construction vehicles, then the number of bird species will decrease. B) If construction vehicles are in a wetland, then the birds will become too frightened to reproduce. C) If bird numbers decrease in a wetland, then construction vehicles must have polluted the environment. D) If construction vehicles enter a wetland, then new predators will arrive and reduce the bird populations.
If a parent cell has a diploid number of 18 chromosomes before mitosis, how many chromosomes will the daughter cells have?
a. 9 b. 36 c. 18 d. 64 e. 27
Most mycoses are difficult to treat because
A) many fungi have developed resistance antifungal agents. B) fungicides are rapidly metabolized by the liver. C) fungal cells provide few targets for selective toxicity. D) treatment causes major disruption of the microbiota. E) fungicides are extremely expensive.
All of the following are advantages of attenuated vaccines over inactivated vaccines exceptÂ
A. they confer longer lasting protection. B. they require fewer boosters. C. they can be transmitted to other people. D. they require smaller doses. E. they produce infection but not disease.