Which of the following is NOT an example of symbiosis?
A) bacteria in the human colon
B) tapeworm in the human intestine
C) tuberculosis in the human lung
D) protozoa in termites
E) microbes passing across the placenta to the fetus
E
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Which of the following proteins is responsible for advancing a cell through the four phases of the cell cycle?
A. caspases B. cyclins C. claudins D. endonucleases E. cofactors
Enzymes work with at least three mechanisms. Which of the following is not a mechanism by which enzymes function?
a. putting reactants in close proximity to each other b. altering the free energy (?G) of the reaction c. altering the immediate environment of the reactants to promote reactant interactions d. orienting the reactants so they are positioned to favor the transition state
In the United States, parathion is the most widely used member of a class of ____
a. organophosphate herbicides b. organophosphate insecticides
c. chlorophosphate fungicides d. chlorophosphate herbicides e. chlorophosphate insecticides
Severe Acute Respiratory Syndrome (SARS)
A. is not highly transmissible. B. is caused by the respiratory syncytial virus. C. can cause high fever, pneumonia, respiratory distress. D. began with an initial outbreak in the United States and then spread to Canada and China. E. All of the choices are correct.