Generally, how many cholera vibrios are required to cause disease?
a. 1 to 10
b. 100s to 1000s
c. 1000s to millions
d. more than 108
Answer: D
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The single most important physical sign of primary syphilis is
A) the chancre. B) a skin rash. C) paralysis. D) an acute eye infection.
A catastrophic drop in diversity is known as a ____
Fill in the blank with the appropriate word.
Thomas Bell and his colleagues studied bacterial species richness in isolated European beech treehole basins
("islands"). Their data showed that ______.
a. island size affects beech tree populations b. the number of bacterial species decreases with treehole volume c. the number of bacterial species increases with treehole volume d. large beech trees support higher bacteria populations than small beech trees e. the species-area effects on bacterial species differs from species-area effects on animal and plant populations on true islands
If the ?G of a reaction was -31.45 kJoules, you would know that
A. the reaction is spontaneous. B. the reaction requires an energy input of 31.45 kJoules to proceed. C. the reaction most likely leads to development of a more ordered system. D. the products have more free energy than the reactants.