The aspect of the immune response that vaccines are based on is
A) inflammation and fever.
B) stimulation of cellular, as opposed to humoral, immunity.
C) stimulation of phagocytosis.
D) protection of the normal microbiota.
E) production of memory cells and high antibody titers from pathogen exposure.
Answer: E
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The most serious consequence to humans of a decrease in global biodiversity would be the _____
A) increase in global warming and thinning of the ozone layer B) potential loss of ecosystem services on which people depend C) increase in the abundance and diversity of edge-adapted species D) loss of source of genetic diversity to preserve endangered species E) loss of species for use as crops.
Which of the following is NOT true regarding bone repair?
A) immediately after breaking a bone, a hematoma forms as blood clots in the injured area B) Osteoblasts convert cartilage to bone in the injured area. C) a callus of fibrocartilage forms to hold the two broken ends of the bone together D) bones heal more quickly as an individual ages
Oxygen is used during a reaction if the process is:
A. oxygenic. B. anoxygenic. C. aerobic. D. anaerobic.
The capsule in streptococcus pyogenes is considered a virulent factor because it
A. is antiphagocytic B. binds to epithelial cells C. mediates internalization by host cells D. degrades complement component C3b E. binds to IgM and IgG