An example of a ?-hemolytic gram-positive organism is:

a. Staphylococcus aureus.
b. S. pneumoniae.
c. Escherichia coli.
d. Enterococcus.


A
The only gram-positive ?-hemolytic organism in this listing of answers is S. aureus. S. pneumo-niae is ?-hemolytic, and Enterococcus is either ?- or ?-hemolytic. Although E. coli appears to ?-hemolytic on blood agar, it is a gram-negative organism.

Biology & Microbiology

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Which mutations can interfere with the proper insertion of a protein in the plasma membrane?  

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Biology & Microbiology

One of the ways agricultural production of such fruits as tomatoes or cucumbers can be increased significantly is to grow them in:

A. soils rich in magnesium B. soils rich in nitrogen C. greenhouses supplied with extra carbon dioxide D. greenhouses with extra oxygen E. None of these is true

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Explain the function of ATP in muscle contractions

What will be an ideal response?

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Of the four haploid cells produced by a pine cone's megasporocyte (megaspore mother cell), _____ survive(s).

a) one b) integuments c) four d) three e) two

Biology & Microbiology