Individuals that are heavy smokers may eventually have trouble clearing the mucous from their lungs because the structures that move fluid along the epithelial lining of the lung become damaged over time. What are these structures called?
A. Flagella
B. Cell walls
C. Cilia
D. Pili
Answer: C
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Because they are filter feeders, oysters are
most sensitive to pollution levels in their habitat and among the first organisms to suffer if pollution levels become too high. Oysters are an example of ___ species.
a. an endangered b. an endemic c. an indicator d. a threatened e. a conserved
In the mosses, archegonia produce
A. eggs. B. zygotes. C. diploid cells. D. sperm.
To initiate a signal transduction pathway, a signal binds to a receptor protein usually located in the
A) nucleus. B) plasma membrane. C) ER. D) cytoplasm.
All of the following are correct about Type O blood, except
A) Persons with this type of blood are considered universal donors. B) Persons with this type of blood have anti-A and anti-B antibodies in their plasma. C) This is the most common blood type among all racial groups in the U.S. D) Persons with this type of blood carry an O antigen on their RBC.