When assessing the role of conjugative bacteria in the spread of antibiotic resistance genes, it is fair to say that Hfr cells contribute most while F- cells contribute least.
Answer the following statement true (T) or false (F)
True
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You paid $1,000,000 to purchase a black Angus bull named Maxwell that was advertised as a "pure-breeding" black Angus cow (BB; B = black and b = brown; B is dominant to b)
You mated Maxwell with Bessie, who also was advertised as a pure-breeding black Angus cow (BB); as you expected, all of their offspring were black. Several years later, you mated a pair of these offspring several times (F1 × F1) and found that approximately 25% of the F2 progeny were brown instead of black. What were the actual genotypes of the original cross (Maxwell × Bessie)? A) BB × BB B) Bb × BB C) Bb × Bb D) BB × bb E) bb × bb
What cells directly stimulate the activity of other cells in the generation of an immune response?
A. T cells B. Monocytes C. B cells D. Natural killer cells E. Plasma cells
A true-breeding red rose is repeatedly mated with a true-breeding white rose, and all of their offspring are red. If two of these red offspring are mated, what percentage of their offspring will be red?
a. 60% b. 75% c. 100% d. 25% e. 50%
In 1858, a German scientist named Rudolph Virchow stated that spontaneous generation of living things from nonliving matter was impossible. This statement contributed to the development of the cell theory. In effect, what was Virchow saying?
A) Cells exist in a wide variety of shapes and sizes. B) All cells come from existing cells. C) The cell is the basic unit of all organisms. D) Cells are alive.