Which of the following is a Gram-negative bacterium that acts as a predator on other Gram-negative bacteria, and might be used to control populations of Gram-negative human pathogens in locations such as poultry farms?
A. Salmonella enteritidis
B. E. coli
C. Vibrio choerae
D. Bdellovibrio
Answer: D
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If a water molecule passes through the outer membrane of a chloroplast, how many more membranes will it have to move through to be in the stroma?
A. 1 B. 2 C. 3 D. 4
Chytridiomycetes produce enzymes that digest cellulose, chitin, and similar molecules. Because of this, they are found in the digestive tract of
A. lichens. B. ruminants. C. plants. D. frogs. E. people.
Which of the following are the bones that form the bridge of the nose?
A) occipital B) sphenoid C) nasal D) temporal
What is the initial step in DNA replication?
A) unwinding of the DNA double helix B) formation of the mitotic spindle C) breakdown of the nuclear envelope D) formation of the cleavage furrow