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.
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Which mutations can interfere with the proper insertion of a protein in the plasma membrane?
A. A polar amino acid to a non-polar amino acid within a transmembrane domain B. A non-polar amino acid to a polar amino acid within a transmembrane domain C. A polar amino acid to a non-polar amino acid within a cytoplasmic domain D. A non-polar amino acid to a polar amino acid within a cytoplasmic domain Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about the amino acids found in a transmembrane domain? What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
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
Explain the function of ATP in muscle contractions
What will be an ideal response?
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