Carbon dioxide is an example of a(n)
a. atom.
b. ion.
c. compound.
d. mixture.
e. element
C
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Which of the following is not true of the outer membrane?
A. Gram-positive bacteria have an outer membrane. B. The lipid portion of the lipopolysaccharide layer is termed endotoxin. C. Porins create channels through the outer membrane. D. The innermost layer is a phospholipid bilayer. E. The uppermost layer is made of lipopolysaccharide.
What term defines the characteristics that suit an organism to the conditions of a particular environment?
a. genotypes b. genetic drift
c. adaptations d. inheritance e. mutations
Which statement about 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.
Compared to ELISAs, immunofiltration assays
A. are faster. B. are more accurate C. require more material. D. take more time. E. are less accurate.