Which of the following is a typical characteristic of molluscs?
A) a gastrovascular cavity with only one opening
B) a sessile lifestyle
C) an internal skeleton and segmented body plan
D) a rasping organ called the radula
Answer: D
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Athlete's foot is caused by:
A. Candida albicans B. Aspergillus fumigatus C. Amanita muscaria D. Claviceps purpurea E. none of the choices provided
In a spinal cord injury, nerve signals cannot proceed past the location of the injury. What part of the spinal cord was damaged if a person, who is quadriplegic, can move their head and neck, but not their arms, abdomen, or legs?
A. thoracic B. lumbar C. cervical D. sacral E. coccyx
Freshwater is most likely to be polluted
A) by oil spills in ocean water moving inland. B) as a result of eutrophication. C) by contaminants from aquifers moving to surface waters. D) from organic solvents and farming chemicals in surface water runoff. E) by radioactive waste seeping from nuclear reactors.
Which of the following bacterial products is NOT an exotoxin?
A) Clostridium perfringens ?-toxin. B) Streptolysin O. C) Diphtheria toxin. D) Escherichia coli lipopolysaccharide. E) Escherichia coli enterotoxin.