What do zygospores, ascospores, and basidiospores have in common?
A. They are sexual spores.
B. They are types of conidia.
C. They are found only in molds.
D. They are enclosed in a sac.
E. All of these choices are correct.
Answer: A
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Protein hormones include
a. estrogens. b. growth hormone. c. melatonin. d. thyroid hormone. e. oxytocin.
The accompanying figure shows the results of Jackson and Cheetham's studies on fossil and living cheilostome bryozoans. What can you infer from these diagrams?
A) Species of bryozoan have tended to persist with very little morphological change. B) Bryozoans have unusually low genetic diversity. C) Bryozoans predominantly evolve by phyletic transformation, or anagenesis. D) Bryozoans have suffered heavily from extinction events on islands. E) It is hard to define bryozoan species because of the presence of so many intermediate forms.
The ________ equation accounts for the movement of a single ion type, while the ________ equation takes into account the movement of multiple ions on membrane potential
Fill in the blank with correct word.
Consider a community in which the vaccination rate for measles is 99 percent. Ryan, a 2-year-old with leukemia, has not received the measles vaccination because of his immunocompromised status. Ryan is unlikely to get measles because
A. the measles virus does not typically affect children with leukemia. B. measles has been completely eradicated and is no longer a threat. C. there is substantial herd immunity in his community. D. he is protected by antibodies from his mother that crossed the placenta.