Which fact correctly distinguishes the archaea from other organisms?
A) They are the only prokaryotic organisms.
B) They evolved from modern-day eukaryotes.
C) They have cell walls composed of unique polysaccharides.
D) They live in moderate environments.
E) They are the only group that lacks organelles.
Ans: C) They have cell walls composed of unique polysaccharides.
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Sea otter populations were reduced by overhunting, allowing an overgrowth of one of their prey
animals, the ____, which consumed populations of ____ and decimated them.
a. crabs; shrimp b. abalone; algae c. sea urchin; kelp d. harbor seals; fish e. crab; kelp
In the experiments by Arnold, et al., why were some leaves on a cacao plant treated with endophytes and others were not?
A. to control the amount of Phytophthora that spread to other plants B. to provide a control for comparison of treated and untreated C. to reduce the amount of endophyte spores that were needed D. endophytes spread from one leaf to another E. to reduce the number of plants that were needed
What is the main purpose of the extracellular matrix surrounding osteocytes?
a) Cell growth b) Cell division c) Bone repair d) Bone strength
Which of the following findings was essential for Edward Jenner's vaccination process?
A) Exposure to a milder disease form may produce immunity. B) A weakened microorganism will not cause disease. C) Someone who recovers from a disease will not acquire that disease again. D) Disease is caused by viruses. E) Pathogenic microorganisms infect all humans and animals in the same manner.