With respect to the enzyme that converts X to Y, substance A functions as _____
A) a coenzyme
B) an allosteric inhibitor
C) the substrate
D) an intermediate
E) a competitive inhibitor
Answer: B
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Carotenoids are important to many plants because these pigments are able to
A. remove carbon dioxide from the air. B. absorb wavelengths of light that neither chlorophyll a nor b can absorb. C. absorb water so that hydrolysis can be carried out in the chloroplasts. D. capture UV radiation that is harmful to the DNA in the nucleus of plant cells. E. store electrons for use during the "dark" reaction of photosynthesis.
How many distinct aminoacyl-tRNA synthetases does each cell make?
A. ~1 B. ~20 C. ~60 D. ~120 E. ~180
The critical enzymatic virulence factor that helps allow Helicobacter pylori survive in the harsh acidic environment of the stomach is ________, which drives the local pH up.
What will be an ideal response?
n example of ex situ conservation is a(n):
a. a national park. b. a zoo. c. a reserve. d. a pet store. e. a circus.