Which of the following regions has the greatest distribution of HIV infection and AIDS in the world?
A) North America
B) Eastern Europe and Central Asia
C) South and Southeast Asia
D) sub-Saharan Africa
E) Latin America
D
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Why are the chances of an immune response in a patient given between 10 µg and 1g of an immunogen (drug) higher than a patient given higher than 1g or lower than 10 µg of the same drug?
What will be an ideal response?
When ____ cells mature, they develop thick secondary walls strengthened by lignin and cellulose and die, leaving
empty cells that serve as pipelines for water and mineral transport.
a. sclerenchyma b. tracheids c. collenchyma d. parenchyma e. vessel members
What cells are phagocytes that can also present antigens to TH cells?
A. B cells B. macrophages C. plasma cells D. T cells E. monocytes
The all-or-none reaction means that:a
if a stimulus is strong enough, all axons in a nerve bundle will fire simultaneously. b. a neuron will only produce an action potential if it has been depolarized to its threshold level. c. all neurons discharge impulses at the same frequency. d. a neuron can create an action potential of varying intensities. e. either all or none of the neurons will fire impulses when stimulat