Unicellular prokaryotes
A) lack a membrane bounded nucleus
B) are found in the domains Bacteria and Archaea
C) are found in almost all habitats
D) are structurally simple and metabolically complex
E) All of the choices are correct.
Ans: E) All of the choices are correct.
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Why don't ants that protect the Acacia tree scare off bees trying to pollinate the tree's flowers?
A. They can't climb to the tops of the tree. B. The bees are too big. C. The bees fly in and out quickly. D. The open flowers contain a chemical that is an ant deterrent. E. Parasitoid wasps protect the bees from attack.
Bacteriad chemoautotrophs use organic chemicals as an energy source
____________ Indicate whether the statement is true or false.
6CO2 + 6H2O ® C6H12O2 + 6O2. In this reaction O2 is
A. a reactant. B. a product. C. a reactant and a product. D. neither a reactant nor a product.
Generally, what must healthy adults consume in order to contract botulism?
A. spores of C. botulinum B. vegetative cells of C. botulinum C. botulin toxin on contaminated food D. botulin toxoid on contaminated food E. botulin antitoxin on contaminated food