How is the syphilis spirochete initially transmitted?
A) penetration of unbroken skin
B) through the eyes
C) from mother to child
D) through tiny breaks in the skin epithelial layer
Answer: D
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Ecology is the same as environmentalism
Indicate whether the statement is true or false
What might be an accurate albedo measure of the surface of a glacier?
A) 0.1 B) 9.0 C) 0 D) 0.9
Researchers discovered that a new strain of bacteria that cause tuberculosis (M. tuberculosis) taken from a dead patient has a point mutation in the rpoB gene that codes for part of the RNA polymerase enzyme
This mutant form of RNA polymerase does not function as well as the more common form of RNA polymerase. A commonly used antibiotic called rifampin does not affect the mutant rpoB bacteria. A researcher mixes M. tuberculosis with and without the rpoB mutation and adds the bacteria to cell cultures. Half the cell cultures contain only standard nutrients, while the other half of the cell cultures contain rifampin and the standard nutrients. After many cell generations, the researcher finds that _____. A) very few M. tuberculosis in the standard nutrient cell cultures carry the rpoB gene mutation, but almost all of the M. tuberculosis in the cell cultures with rifampin carry the rpoB mutation B) almost all M. tuberculosis in the standard nutrient cell cultures carry the rpoB gene mutation, but very few of the M. tuberculosis in the cell cultures with rifampin carry the rpoB mutation C) very few M. tuberculosis in any of the cell cultures carry the rpoB gene mutation D) almost all of the M. tuberculosis in both types of cell cultures carry the rpoB mutation
John Snow is known as the Father of_____________.
Fill in the blank(s) with the appropriate word(s).