What group of organisms fixes nitrogen?
a. bacteria
b. earthworms
c. fungi
d. protozoa
e. algae
a
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Neurotoxins are produced by:
A) Clostridium botulinum and Clostridium tetani. B) Clostridium difficile and Clostridium perfringens. C) Pseudomonas aeruginosa and Mycobacterium tuberculosis. D) Staphylococcus aureus and Streptococcus pyogenes.
One of the most important uses of the Gram stain of expectorated sputum received for routine bacteriologic culture is to:
a. give the physician a quick analysis of the type of organism causing the infection. b. evaluate the quality of the specimen. c. distinguish between the possibilities of bacterial and viral sources of infection. d. begin appropriate antimicrobial therapy as soon as possible.
This illustration shows
a. cytoplasmic division in an animal cell. b. a contractile ring mechanism. c. how chromosomes are dragged to the poles. d. cytoplasmic division in an animal cell and a contractile ring mechanism. e. cytoplasmic division in an animal cell and how chromosomes are dragged to the poles.
Primary producers form the base of all food chains
Indicate whether the statement is true or false