Which of the following best describes the role of regulatory T cells?
A) Regulatory T cells are a kind of helper T cell that stimulates B cells.
B) Regulatory T cells stimulate natural killer cells to attack tumors.
C) Regulatory T cells are a kind of helper T cell that stimulates cytotoxic T cells.
D) Regulatory T cells stabilize and support memory cells.
E) Regulatory T cells help limit the immune system response.
Answer: E) Regulatory T cells help limit the immune system response.
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Which of the following is described as a spore-forming, gram-positive Bacillus that is hemolytic, motile, Voges-Proskauer (VP)–positive, and citrate-positive and causes two types of food poisoning as a result of toxin release?
a. C. diphtheria b. B. anthracis c. B. cereus d. C. jeikeium
Transcription starts at a region of DNA called a(n) _____
a. sequencer b. promoter c. activator d. terminator e. transcriber
Evaporation is a cooling process because
What will be an ideal response?
The almost complete loss of the American chestnut tree to the chestnut blight fungus had ____ ecological impact on
the moderately diverse Appalachian woodlands of which it was formerly a part. a. little b. great c. moderate d. undetectable e. detectable