To test the validity of catalase reagent, which two organisms should be used?

a. A. actinomycetemcomitans and Kingella kingae
b. C. hominis and A. aphrophilus
c. K. denitrificans and K. kingae
d. Actinobacillus suis and Actinobacillus ureae


A
Only A. actinomycetemcomitans and K. kingae are positive and negative for catalase, respectively. C. hominis, A. aphrophilus, K. denitrificans, and K. kingae are catalase-negative, and both A. suis and A. ureae are variable for catalase.

Biology & Microbiology

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The cyclic carbon fixation reactions are also known as the  

A.  Krebs cycle. B.  Calvin cycle. C.  citric acid cycle. D.  tri carboxylic acid cycle.

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Phage-encoded proteins are

A. coded for by host DNA. B. coded for by phage DNA. C. proteins normally present in the uninfected cell. D. early proteins. E. coded for by phage DNA AND early proteins.

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The process of the body using simple substances to build more complex substances is called:

a.) anabolism
b.) homeostasis
c.) metabolism
d.) catabolism

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The lacteal, a lymphatic vessel in the center of each intestinal villus, functions in digestion by absorbing

A. nucleic acids. B. carbohydrates. C. vitamin C. D. proteins. E. lipids.

Biology & Microbiology