What products would be expected to form during anoxic degradation of the seven-carbon compound benzoate following reduction and cleavage of the aromatic ring?
A) 1 three-carbon compound and 1 four-carbon compound
B) 1 three-carbon compound and 2 two-carbon compounds
C) 2 three-carbon compounds and CO2
D) 3 two-carbon compounds and CO2
Answer: B
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An opening in leaves that functions in the exchange
of gases is called a a. cuticle. b. stoma. c. guard cell. d. pit. e. pore.
Which one of the following statements about the BRCA1 gene for breast cancer is FALSE?
A. It was discovered by Mary-Claire King and her colleagues. B. The gene is also linked to ovarian cancer. C. One mutated copy of BRCA1 is sufficient to cause cancer. D. Although only 1 in 200 females inherit it, 90 percent of them will develop breast cancer. E. It is located on the long arm of chromosome 17.
Standing out in center field, the baseball player watches the hitter's bat strike the ball and then, slightly later, hears the sound of the impact. What types of sensory receptors did the player just use?
A) thermoreceptors and chemoreceptors B) photoreceptors and mechanoreceptors C) chemoreceptors and pain receptors D) pain receptors and thermoreceptors
Normally, the mold Neurospora can synthesize all 20 amino acids. A certain strain of this mold cannot grow in minimal nutritional medium, but grows only when the amino acid leucine is added to the medium. This strain
A. has a mutation in the gene that encodes the leucine tRNA B. has a mutation in the gene that encodes the enzyme that "charges" the leucine tRNA\ C. is dependent on leucine for energy D. has a mutation affecting the biochemical pathway leading to the synthesis of leucine