Answer the following questions true (T) or false (F)
1. Even small concentrations of bicoid protein will cause the anterior portion of an organism to form there.
2. Bicoid is only one type of morphogen.
3. In chickens, the wings develop from a zone of polarizing activity (ZPA).
1. FALSE
2. TRUE
3. TRUE
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Which statement is true?
a. Once a vaccine for a virus has been developed, further vaccine development is unnecessary. b. Antiviral drug therapy is safer than vaccination because there is no risk of tissue damage involved. c. Viruses nearly eliminated by mass immunization campaigns can still cause epidemics. d. Vaccinations contain dangerous quantities of chemicals such as mercury and formaldehyde.
Which group does NOT belong to the alveolates?
a. apicomplexans b. diatoms c. free-living ciliates d. dinoflagellates e. parasitic ciliates
A survivorship curve that shows a population producing very few offspring, each of which has a high probability of surviving to adulthood, is typical of
A) sea stars. B) elephants. C) oysters. D) rodents.
Which of these muscle types permit(s) voluntary movement?
A) skeletal B) cardiac C) smooth D) All of the above permit voluntary movement.