In ____, antibodies bind to toxin molecules, preventing them from carrying out their damaging action
a. inflammation
b. phagocytosis
c. agglutination
d. neutralization
e. clonal selection
ANSWER: d
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At which regulation level is DNA uncoiled and loosened from nucleosomes in eukaryotic organisms?
a. At the translational level b. At the epigenetic level c. At the transcriptional level d. At the post-transcriptional level
This animal has a coelom, a closed circulatory
system, and a clitellum. This animal is ___.
a. an earthworm b. a leech c. a roundworm d. a planarian e. more than one of these
Mangrove plants live in areas regularly flooded with salt water. Which of these is not a possible mechanism for controlling their salt balance?
A. The succulent leaves contain large quantities of water that dilute salt that is absorbed. B. Excess salt is stored in special tissues. C. The roots block salt uptake. D. Modified roots emerge above the water level and help oxygen diffuse into the roots. E. Absorbed salt is secreted from special salt glands.
The viruses responsible for the majority of infant deaths resulting from diarrhea in the world are the
A) noroviruses. B) rotaviruses. C) caliciviruses. D) astroviruses. E) hepaciviruses.