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Legionella pneumophila is generally transmitted by
A) contaminated food.
B) contaminated drinking water.
C) contaminated water in coolers, pools, and domestic water systems.
D) personto-person contact.
Chemolithotrophy involves
A) oxidation of organic compounds.
B) oxidation of inorganic compounds.
C) reduction of organic compounds.
D) metabolic autotrophy.
Horizontal gene transfer
A) is rare and only occurs between closely related strains.
B) is common and may sometime occur between unrelated organisms.
C) does not provide an advantage to organisms.
D) only occurs in prokaryotes.
In negative control of transcription, how does the presence of an inducer affect
transcription?
A) The inducer binds to the operator.
B) The inducer does not bind to the operator.
C) The inducer causes the repressor to bind to the operator.
D) The inducer prevents the repressor from binding to the operator.
Based on our understanding of the early stages of life, ________ is/are thought to be
one of the earliest forms of metabolic regulation that evolved.
A) attenuation
B) feedback inhibition
C) riboswitches
D) transcription factors
