Which animals use air sacs to ventilate their lungs?
a. reptiles
b. horses
c. birds
d. frogs
Answer: c. birds
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Correctly match each group of mollusks with the descriptions below. a. gastropods b. cephalopods c. bivalves d. gastropods and cephalopods only e. gastropods, cephalopods, and bivalves
_____ snails and slugs _____ obtain food by filtering particles from seawater using siphons _____ are able to learn visual patterns and solve puzzles _____ most of the 80,000 described species of mollusks fall into this one group What will be an ideal response?
Why might it be more difficult to prepare a vaccine against noroviruses than against rotaviruses?
A. We haven't been able to culture noroviruses in a lab setting yet. Without a starting culture, we can't create a vaccine. B. Noroviruses are RNA viruses, where rotaviruses are DNA viruses. RNA viruses mutate far more easily than DNA viruses, so we COULD make a vaccine, but it would be rendered useless fairly quickly as the virus mutates. C. We lack a proper culturing method for large-scale production of target cells for norovirus, whereas we have such a system for the target cells of rotaviruses. Without a system to get large numbers of target cells, we can't produce a vaccine. D. Norovirus is much more infectious than rotavirus. As such, it's much harder to work with safety. This makes production of a vaccine too dangerous and unpredictable
Which biological events took place during the Paleozoic Era and the Mesozoic Era?
A. During the Paleozoic Era, three mass extinctions occurred which led to the colonization of land by plants, while during the Mesozoic Era, gymnosperms became the dominant plant life. B. During the Mesozoic Era, five mass extinctions occurred which led to the colonization of land by plants, while during the Paleozoic Era, angiosperms became the dominant plant life. C. During the Paleozoic Era, five mass extinctions occurred which led to the colonization of land by plants, while during the Mesozoic Era, angiosperms became the dominant plant life. D. During the Mesozoic Era, three mass extinctions occurred which led to the colonization of land by plants, while during the Paleozoic Era, gymnosperms became the dominant plant life.
How does the protozoan Trypanosoma evade detection by the immune system?
A) It produces a capsule which is composed of polysaccharides similar to those found in the host. B) It can change the surface antigens frequently, preventing the immune system from tracking it. C) It prevents phagosome-lysosome fusion. D) It can resist oxidation inside macrophages.