Which of the following is NOT a function of
some leukocytes?
a. engulf and destroy damaged or dead cells
b. engulf anything recognized as foreign
c. call up specific immune responses
d. carry out specific immune responses
e. secrete substances that initiate blood
clotting
E
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In the figure above, which number represents DNA synthesis?
A) I B) II C) III D) IV E) V
Only particles smaller than ________ µm in diameter reach the lungs
A) 10 B) 20 C) 30 D) 40
The host range of a virus is determined by
A. the type of genetic information the virus contains. B. All of the answer choices are correct. C. the shape of the virus. D. specific receptors on cells it infects. E. the particular life cycle of the virus.
Each muscle fiber is also called a ______.
a) muscle cell b) myofibril c) sarcomere d) muscle