The introduction of a novel organism into an ecosystem can lead to the extinction of species
Indicate whether the statement is true or false
TRUE
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MacConkey agar and eosin-methylene blue (EMB) agar are ________ media
A) selective but not differential B) differential but not selective C) both selective and differential D) neither selective nor differential
Acinetobacter baumanii has become a high-profile opportunistic pathogen, causing wound infections, urinary tract infections, pneumonia and septicemia. What is the reason for its high-profile nature?
A.) A. baumanii has a very low infective dose and nearly everyone that contacts it gets a very serious infection. B.) A. baumanii produces an exotoxin that causes servere diarrhea. C.) A. baumanii is very fastidious and is difficult to culture in the laboratory. D.) Many strains of A. baumanii are highly resistant to antibiotics.
Replication of the E. coli chromosome is initiated at
A. a single site. B. two sites. C. 10 sites. D. multiple sites.
Channels that open in response to neurotransmitters or other signal molecules are called _______ channels.
a. voltage-gated b. ligand-gated c. signal-gated d. ion