B cells secrete antibodies when they
A) bind antigens.
B) are engulfed by macrophages.
C) are stimulated by activated T cells.
D) undergo apoptosis.
C) are stimulated by activated T cells.
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The most efficient way to increase essential amino acids in crop plants for human consumption would be to _____
A) select for higher yield of the desired amino acids B) increase the amount of fertilizer used on fields C) use 20-20-20 fertilizer instead of 20-5-5 fertilizer D) engineer nitrogen-fixing nodules into crop plants lacking them E) increase irrigation of nitrogen-fixing crops
What is a disadvantage of using fossils to reconstruct phylogenetic history?
A. Fossils are a physical record of organismal structure. B. Fossils yield information about the timing and order of events in the past. C. Fossils reveal relatedness. D. The probability of fossilization varies among species.
Where does the name "scrapie" come from?
a. The prion disorder causes infected sheep to scrape against objects until their skin is raw. b. The prions cause amyloid plaques to scrape against each other. c. The disease results in the animal wasting away, sending them to the "scrap heap."
Which of the following situations does not result in a breakdown of the proton gradient?
a. Cyanide poisoning b. Oxygen deprivation c. Uncoupling proteins