Escherichia coli have been transformed with the luciferase gene so that emissions of light can serve as indicators of ________
a. contamination of meat and other foods
b. pathogenecity
c. contamination of laboratory surfaces
d. metabolic activity
d
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What fraction of the time will the cross of Aa Bb with Aa Bb produce an offspring that will express the dominant trait
for one of the two alleles? a. 16/16 b. 9/16 c. 6/16 d. 3/16 e. 1/16
Which of the following can be used to determine a twig's age?
A) Number of apical bud scar rings B) Number of leaf scars C) Number and arrangement of axillary buds D) Length of internodes
Cells that help initiate the adaptive immune response by placing microbial antigens on their surfaces are generally referred to as:
A) regulatory T cells. B) B cells. C) antigen-presenting cells. D) helper T cells. E) mast cells.
A ________ is a mass of neoplastic cells.
A. diploid culture B. metastasis C. tumor D. gall E. plaque