In the acquired immune system, helper cells do all of the following EXCEPT
A. first detect an infection.
B. alert B cells that an infection has occurred.
C. enhance the innate immune system.
D. produce antibodies.
D. produce antibodies.
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Explain how viruses are postulated to cause cancer
What will be an ideal response?
The efficiency and specificity of adaptive immune defenses and immunological memory improve each time a particular pathogen is encountered because _____
a. of protective immunity b. effector memory T cells outnumber central memory T cells c. the half-life of antibodies made in secondary and tertiary immune responses exceeds that of antibodies made in primary immune responses. d. of affinity maturation.
Each year approximately ____ adolescent girls become pregnant.
A. 300,000 B. 450,000 C. 1 million D. 1.5 million
Health education standards specify what students should know and be able to do.
Answer the following statement true (T) or false (F)