How would you recognize an antibiotic-producing soil bacterium on a plate crowded with other bacteria? The bacterial colony producing the antibiotic would be __________.
a. surrounded by a clear area
b. red or yellow
c. star-shaped
d. visible as masses called mycelia
e. characterized by pseudopods
Ans: a. surrounded by a clear area
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The E. coli origin, oriC, contains:
A. four 9-base-pair consensus sequences. B. three AT-rich direct repeats. C. eleven GATC sites. D. four 9-base-pair consensus sequences and three AT-rich direct repeats. E. four 9-base-pair consensus sequences, three AT-rich direct repeats, and eleven GATC sites.
When an electron absorbs energy, it moves to a ________, and when it releases that energy, it ________
a. lower orbital / returns to its original position b. none of the choices c. higher orbital / returns to its original position d. higher orbital / emits radioactivity
The most common form of eye cancer is ____
a. conjunctivitis b. malignant melanoma c. retinoblastoma d. macular degeneration e. glaucoma
Given the following table:
Supplement 1 2 3 4 Strain A + - + - Strain B + + + - Strain C + + + + Strain D - - + - where numbers 1 through 4 indicate four supplements that must be added to sustain growth of the organism, determine a possible metabolic pathway that would give the results seen for the four mutant strains, A through D.