Which of the following statements concerning a secondary immune response is false?
a. It is a response to an antigen.
b. It may occur years after a primary response.
c. It involves memory cells.
d. It has a longer latent period than a primary response.
e. It is stimulated by less antigen than in a primary response.
D
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The most selective antibacterial agents are those that interfere with bacterial cell wall synthesis. This is because
A. bacterial cell wall synthesis is easily inhibited whereas eukaryotic cell wall synthesis is more resistant to the actions of the drugs. B. eukaryotic cells inactivate the drugs before they can do any damage. C. bacterial cell walls have a unique structure not found in eukaryotic host cells. D. eukaryotic cells do not take up the drugs.
Fill in the blanks to complete the following statements. ? A surgical instrument contaminated with? norovirus is used on another patient and as a result transmits the illness. The instrument can be referred to as a __________
Fill in the blank(s) with correct word
Prenatal diagnosis is available for all of the following disorders EXCEPT
A) Down syndrome. B) AIDS. C) cystic fibrosis. D) sickle-cell anemia.
Which of the following is NOT a way to move materials across prokaryotic plasma membranes?
a) Endocytosis b) Simple diffusion c) Facilitated diffusion d) Osmosis