A gene operon consists of
A) a transcribed gene only.
B) a promoter only.
C) a regulatory gene only.
D) transcribed genes, an operator, and a promoter.
Answer: D
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Which of the following sequences correctly lists the hierarchical nature of cellular structures, from smallest to largest?
A) organic molecules, supramolecular structures, macromolecules, organelles, cells B) organelles, organic molecules, supramolecular structures, macromolecules, cells C) organic molecules, macromolecules, organelles, supramolecular structures, cells D) organic molecules, macromolecules, supramolecular structures, organelles, cells E) macromolecules, organic molecules, supramolecular structures, organelles, cells
The organism in the tropics that replaces limpets in the supralittoral fringe is
a. turtle grass. b. nerites. c. the hermit crab. d. knobby periwinkle. e. the coconut crab.
Why are phosphorylation and dephosphorylation reactions commonly used to regulate signal transduction pathways?
A. The addition or removal of a phosphate group can expose or hide potential binding sites in proteins or change protein activity. B. Phosphate groups are efficient second messengers. C. Protein kinases and phosphatases are abundant in most cells. D. The hydrolysis of bound GTP generates GDP, which can change the activity of proteins bound to GDP.
The (brain/heart/liver) is the organ most severely damaged by Trypanosoma cruzi
What will be an ideal response?