What cell type engulfs pathogens and foreign particles and signals to the immune system to report the presence of a threat?
a. lymphocytes
b. B cells
c. phagocytes
d. mucus-producing cells
e. normal flora
c
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A plasmid may
A) replicate independently of the chromosome. B) be transferred cell-to-cell during conjugation. C) be integrated into the chromosome. D) replicate independently of the chromosome, integrate into the chromosome, or be transferred cell-to-cell during conjugation.
True or false: some RNA molecules possess catalytic activity
A. true B. false
What statement best summarizes the nature of scientific inquiry? a. Explanations about nature must be testable in ways that others can repeat
b. Once experimentally verified, scientific hypothesis becomes scientific fact. c. Moral, philosophical, and ethical values will eventually be replaced by rational explanations. d. Personal experience, insight, and revelation are as valid as experimental data.
Although not well understood, the Cambrian Explosion most likely occurred due to changes in sea level and continental drift.
Answer the following statement true (T) or false (F)