People do not develop a secondary immune response to influenza because

A) the immune system mutates from season to season.

B) secondary immune responses are only possible against bacteria.

C) the primary immune response is sufficient to protect against flu.

D) the causative viruses mutate each season.


D) the causative viruses mutate each season.

Biology & Microbiology

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The ability to conjugate depends on the presence of a plasmid called the ____ within the donor cell

a. X factor b. F factor c. C factor d. sex pilus e. S factor

Biology & Microbiology

The bending of light rays as they pass from one medium to another is called refraction.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Fox squirrels living in Colorado and Eastern

gray squirrels living in Minnesota provide an example of what type of isolating mechanism?

a. ecological b. temporal c. mechanical d. behavioral e. genetic

Biology & Microbiology

A blood test cannot determine if a person is a carrier of Tay-Sachs disease because the mutant allele is undetectable

a. True b. False

Biology & Microbiology