Please match the type of T cells with the statements that most accurately describe them to test your understanding of the relationships between the types of T cells and their receptors.
CD4
A) All T cells
B) Helper T cells
C) Cytotoxic T cells
B) Helper T cells
Biology & Microbiology
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Which factor increases the likelihood of population extinction?
A. large population size B. isolation of a population from density-independent effects C. isolation of a population from sources of immigrants D. high resource availability E. high genetic diversity
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The mature male gametophyte is indicated by
a. A. b. B. c. C. d. D. e. E.
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Which are lipid-soluble hormones derived from cholesterol?
A. Steroid hormones B. Peptide hormones C. Amine hormones D. Second messengers E. Proteins
Biology & Microbiology
Studies using fissure water from gold-mining operations nearly 3 km deep indicate that the bacteria present use what for energy?
a. organic carbon b. sulfur c. iron d. H2
Biology & Microbiology