Descendant cells that are long-lived and "remember" a particular invader and mount a rapid intense response to it if it should reappear are ________

A) memory cells B) suppressor cells C) helper cells D) macrophages


Answer: A

Biology & Microbiology

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When describing phylogenetic trees, each branching point is called a

a. clade d. lineage b. node e. split c. point

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The response represented by the dashed line in the accompanying figure indicates a:

a. secondary response to the initial antigen. b. primary response to the initial antigen. c. secondary response to an antigen distinctly different from the initial antigen. d. primary response to an antigen distinctly different from the initial antigen. e. secondary response equivalent to a primary response

Biology & Microbiology

Cell wall is seen in both plants and animal cells

a. true b. false

Biology & Microbiology

Which of the following is not a reason why healthcare epidemiology is essential to quality care?

A) Healthcare-acquired infection incidence increased by almost 40 percent from 1975 to 1995. B) Hospitals have been inadvertent sources of infection for thousands of years. C) About 75,000 people die from healthcare-acquired infections every year. D) Healthcare staff are dedicated to helping patients heal. E) Healthcare-acquired infections add an extra $35 billion dollars per year to U.S. healthcare costs.

Biology & Microbiology