Which of the following statements about microorganisms that cause human infection and disease is FALSE?
A. Examples of ectoparasites are fleas, ticks, lice, and scabies.
B. Protozoa rarely cause illness in humans.
C. Prions appear to be made entirely of protein.
D. Bacteria can normally be found in humans.
Answer: B
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_____ is inflammation or infection of the prostate gland
Fill in the blank with the right word.
T-cell activation requires antigen being displayed in the context of an APC and interaction between co-stimulatory molecules on the APC and the T cell
In addition to these two signals, T-cell activity is often influenced by cytokines. Which of the following is an example of how cytokines can influence T-cell activity in the presence of MHC presentation and co-stimulatory ligand interaction? A. CD28 causes memory NK cells to be produced. B. CD8 triggers apoptosis in T cells that recognize self-antigens. C. IL-2 triggers T-cell proliferation. D. Opsonins recruit eosinophils to present carbohydrate antibodies to naïve TC cells. E. TNF-? increases the production of IgM by activated T cells.
In the United States, the biggest component of household trash by weight is
A. metals. B. plastics. C. lawn waste. D. paper products.
A sense of belongingness among college students tends to reduce ____.?
A) ?academic performance B) ?suicidal thoughts C) ?physical activity D) ?emotional outbursts E) ?video game playing