In humans, digestion of starches begins in the
A. large intestine.
B. mouth.
C. duodenum.
D. stomach.
E. esophagus.
Answer: B
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Which of the following statements are not true of the relationship of xylem and phloem?
A. Water exiting the phloem may enter the xylem and be transported to leaves. B. The volume of water moving through the phloem is small compared to that in the xylem. C. The number and size of xylem conduits greatly exceeds the number and volume of sieve tubes. D. In phloem, the plant actively generates the force that drives transport, whereas movement in xylem is largely driven by transpiration. E. Phloem cells are dead at maturity, whereas xylem cells are alive at maturity.
In which one of the following are both important for eukaryotic mRNA stability and translation?
a. promoter and 5'cap b. promoter and 5'UTR c. 5'cap and polyA tail d. introns and 3'UTR
In Bacillus anthracis the lethal factor
A. a protease that inhibits blood clotting B. a metalloprotease that lead to cell death C. binds to cells D. is an adenylate cyclase
A strain with a nonfunctional ________ protein would generate many mutations because the error-prone SOS system would never be repressed
a. RecA b. LexA c. HisC d. DNA polymerase IV