Salivary amylase is produced by
a. parotid glands only.
b. sublingual glands only.
c. submandibular glands only.
d. parotid glands and sublingual glands only.
e. parotid glands, sublingual glands, and submandibular glands.
E
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Chemical synthesis of DNA:
A. requires attachment of a starting nucleotide to a glass or polystyrene bead through its 5' phosphate. B. proceeds in the 5' to 3' direction. C. requires transient protection of the nucleotide's functional groups by chemical modification.These protective modifications are reversible. D. requires that the chemical group used to protect the 3'OH of the pentose is removed at the beginning of each cycle. E. can be used to synthesize small chains of nucleotides up to 10 bases.
A bacterial cell must have ___________ in order to transfer portions of its chromosome to another cell.
A. an F factor B. a high frequency of combination plasmid C. a recombination factor D. growth enhancement genes E. all of these components
HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells B. memory B cells C. helper T cells D. monocytes E. natural killer cells
The lactose repressor
A. is transcribed with the structural lac genes. B. is inactivated by binding lactose. C. requires lactose for its transcription. D. is activated by binding lactose.