The presence of specific ________ signals that a given water source might be contaminated with pathogens
A) exotoxins
B) chemical compounds
C) endotoxins
D) indicator microorganisms
Answer: D
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Which of the following would be part of the appendicular skeleton?
A. pelvis B. jaw C. vertebrae D. ribs E. skull
Where is the biomass pyramid upside-down?
a. among birds b. in forest habitats c. in tundra habitats d. in a pond or a sea e. in prairie habitats
Any heightened immune response resulting in tissue damage is called a(n) ________.
A. autoimmune disease B. desensitization C. immunodeficiency D. transfusion reaction E. hypersensitivity
Which of the following investigators was (were) responsible for the following discovery? In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine
A) Alfred Hershey and Martha Chase B) Oswald Avery, Maclyn McCarty, and Colin MacLeod C) Erwin Chargaff D) Matthew Meselson and Franklin Stahl