Which is NOT a component of a Gram-Negative bacterium's wall?
A. peptidoglycan
B. teichoic acid
C. N-acetylmuramic acid
D. diaminopimelic acid
E. N-acetylglucosamine
Ans: B. teichoic acid
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All of the following are the result of B cell maturation and activation EXCEPT
A. antibody is produced. B. macrophages are activated. C. plasma cells are produced. D. memory cells are produced.
While hiking through the woods on your day off, you find a dead tree that is nevertheless covered in leaves. Closer examination reveals that the leaves belong to a vine that has attached itself to the dead tree’s branches and has no contact with the soil below. What type of roots does this vine possess?
a. tap b. fibrous c. epiphytic d. adventitious
Cells that contain a nucleus are eukaryotic, and cells without a nucleus are ________
Fill in the blank(s) with correct word
Host defenses are NOT compromised by
A) pre-existing disease or infection. B) chemotherapy or immunosuppressive drugs. C) surgery. D) middle age.