What property defines most ligands for intracellular receptors?
A. They are molecules that can perform significant hydrogen bonding interactions with water.
B. They are large molecules.
C. They are lipid soluble.
D. They are hydrophilic.
Answer: C
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Which of the following lymphoid organs or tissues has the immunological function of filtering pathogens from the blood?
A. Lymph nodes B. Thymus C. Spleen D. GALT E. Tonsils
A scientist has tracked the population sizes of wolves and caribou within a national park. Assuming that there are no other prey species available to the wolves, how will the wolf and caribou populations change over time?
A. The wolf population will increase as caribou numbers increase (although there will be a slight lag). B. The wolf population will increase exponentially, regardless of the caribou population. C. The wolf population will decrease as caribou numbers increase (although there will be a slight lag). D. The wolf population will fluctuate between high and low levels, but this will be independent of the caribou population. E. The wolf and caribou populations will fluctuate periodically, and the graphs of their population size will match exactly (i.e., there is no lag).
Which of the following stimulates fibroblasts to proliferate and thus heal a wound?
a. EGF b. NGF a. NO d. PDGF
A reaction between antibody and particulate antigen is called a(n)
A) agglutination reaction. B) complement fixation. C) immunofluorescence. D) neutralization reaction. E) precipitation reaction.