Which of the following DNA sequence elements coordinates the expression of nonadjacent genes in eukaryotes?
A) activation domains
B) response elements
C) epigenetic sequences
D) coactivating elements
E) DNase I hypersensitive sites
Answer: B
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Place the steps of bacterial antigen processing and presentation in the correct order
1. Lysosomal enzymes digest the bacterium into molecular bits. 2. The antigen-MHC complex is displayed on the cell surface. 3. The endocytic vesicle fuses with a lysosome. 4. A bacterium is engulfed by a phagocytic cell.
a. 4-3-1-2 b. 4-3-2-1 c. 3-4-2-1 d. 3-4-2-1 e. 2-4-3-1
Experiments designed by ______________ suggested that living cells caused the fermentation of sugar to produce alcohol
A. Pasteur B. Koch C. Wohler D. Fleming
After the binding of a signaling molecule to a surface receptor, the signaling molecule does not enter the cell
a. True b. False
Bacterial cells are placed into a 250mL liquid growth medium in a closed laboratory flask. According to Malthusian theory, they will reproduce exponentially and then:
A. continue reproducing geometrically as long as there are no limitations on food supply. B. continue reproducing arithmetically as long as there are no limitations on food supply. C. continue reproducing arithmetically until the food supply is used up, then they will cease to grow. D. continue reproducing geometrically until the food supply is used up, then they will cease to grow.