Interferon synthesis
A) protects the synthesizing cell from viral attack.
B) signals cells nearby to synthesize antiviral proteins.
C) blocks viral attachment to nearby cells.
D) degrades viral nucleic acids.
Ans: B) signals cells nearby to synthesize antiviral proteins.
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Match the following items with the correct phrases.
_______1. A decreased number of white blood cells in the peripheral bloodstream. _______2. Increase in the diameter of blood vessels; an initial event in inflammation. _______3. An increased number of white blood cells in the peripheral bloodstream. _______4. Considered to be the first phase of phagocytosis; the means by which phagocytic cells are attracted to sites where they are needed. a. chemotaxis b. leukocidin c. leukocytosis d. leukopenia e. vasodilation
If each human lung contains about 300 million alveoli with a summed total surface area for gas exchange of 40 square meters, what is the approximate surface area of a single alveolus?
A. 0.133 square micrometers B. 7.5 square micrometers C. 750 square micrometers D. 1.33 square micrometers E. 133 square millimeters F. 7.5 square millimeters 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 alveoli? What other information is related to the question? Choose Answer Given what you now know, what information 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 immunoglobulin/s found on the surface of B cells is/are
A. IgD and IgE. B. IgD only. C. IgM only. D. IgG only. E. IgM and IgD.
The hydrogen bonds of water play an important role in the ability of animals to regulate their body temperature
Explain how this occurs. What will be an ideal response?