The chancre of syphilis
A) Occurs due to small hemorrhaging of capillaries.
B) All of the following choices are correct
C) Occurs during the tertiary stage.
D) Is very painful
E) Develops into a lesion with firm margins and an ulcerated central crater.
E) Develops into a lesion with firm margins and an ulcerated central crater.
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The distinct archaeal gene versions of Thaumarchaeota that oxidize ammonia into hydroxyl-amine (NH2OH) is catalyzed by ________.
A. ammonium dismutase (ADM) B. methanofuran (MFR) C. ammonia monooxygenase (AMO) D. methylaspartate pathway (MAP)
Systolic pressure measures the force exerted by blood against the wall of a blood vessel during ventricular contraction.
a. true b. false
Soil particles are classified on the basis of
A) age. B) color. C) water content. D) size.
Match the microbe with an example of its importance to humans.
A. Members of this group have caused "mad cow disease" and Creutzfeld-Jacob disease. B. Members of this microbial group cause serious diseases such as smallpox, AIDS, and Ebola fever. C. Members of this group include decomposers, associate with plant roots and help plants grow, produce antibiotics, help bread rise, and help make wine. D. Members of this group are photosynthetic, include unicellular and multicellular forms, and are the foundation of aquatic food chains. E. This group includes beneficial microorganisms that fix nitrogen and make antibiotics, as well as harmful microorganisms that cause disease such as plague and strep throat.