Release factors of translation recognize the codon
A) AUG.
B) GUA.
C) UGA.
D) GGA.
E) UUU.
Answer: C
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Incubation of cells at 20°C blocks the release of proteins from the trans-Golgi. Under such conditions, you would expect to see
A. an increase in exocytosis. B. a decrease in exocytosis. C. an increase in endocytosis. D. a decrease in endocytosis.
In the accompanying figure, why does the curve sharply drop after approximately 45°C instead of mirroring the slope
of the line going from 0-40°C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
Four of the five characteristics listed below are found
in all chordates. Select the exception. a. tail b. bony vertebrae c. notochord d. nerve cord e. pharyngeal gill slits
The process illustrated in Figure 36-2 is known as:
a. humus formation. b. weathering. c. cation exchange. d. soil erosion. e. salinization.