A drawback of all inactivated vaccines is that
A) they may mutate to a more virulent form.
B) they are quickly cleared from the body, limiting antigen exposure.
C) they are likely to cause disease in immunocompromised hosts.
D) they may cause secondary transmission from the immunized person to another host.
E) they require complex genetic engineering techniques to produce.
Answer: B
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Bronchial washing collected with a double lumen–plugged catheter is:
a. acceptable. b. not acceptable.
A scientist is studying some developing eggs from an ocean sample. The early embryos have divided only a few times, and all cells look identical. When the scientist carefully removes half the cells from an embryo, both clumps of cells are able to complete development, forming twins. The eggs can be identified as:
A. deuterostomes B. protostomes C. crustaceans D. cnidarians E. echinoderms Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about determinate and indeterminate development? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The human b-globin gene has two alleles, HS and HA. Individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. If a vaccine for malaria was created that was 100% effective, affordable, and widely available, what would happen to the frequency of the HS allele?
A. The HS allele would increase in regions where malaria is prevalent and decrease in regions where malaria is absent or rare. B. The HS allele would decrease in regions where malaria is prevalent and increase in regions where malaria is absent or rare. C. Due to balancing selection, the frequency of the HS allele would remain stable in all regions. D. The HS allele would increase in regions where malaria is prevalent and remain stable in regions where malaria is absent or rare. E. The HS allele would decrease in regions where malaria is prevalent and remain stable in regions where malaria is absent or rare.
A bride-to-be is enjoying a manicure and a facial before her hair is styled for the wedding. What organ system is being pampered?
A. lymphatic system B. digestive system C. integumentary system D. endocrine system