Infection by the foodborne pathogen E coli 0157:H7 involves all of the following
ID: 202335 • Letter: I
Question
Infection by the foodborne pathogen E coli 0157:H7 involves all of the following host and pathogen signaling molecules EXCEPT A common structure for proteins that bind DNA is helix-turn-helix. O Al-3 norepinephrine True MCP O False O epinephrine Cells can regulate their metabolism by regulating enzyme activity or by regulating enzyme synthesis (i.e., by regulating whether they produce the enzyme that catalyzes a reaction). Which of the following examples would be the best form of regulation when an enzyme needs to be available very rapidly? View Available Hints) In the lac operon, which of the following conditions would allow the structural genes to be transcribed? View Available Hint(s) OAn enzyme is activated by the binding of a molecule to its allosteric site O Until the enzyme is needed, mRNA transcripts are produced but not translated. Glucose is present and lactose is absent. Lactose is present and glucose is absent. When the enzyme is needed, the relevant operon that contains its gene is activated OWhen the enzyme is needed, the relevant operon that contains its gene is repressed. O Lactose and glucose are present. Lactose and glucose are absent. When environmental levels of amino acids become limited, synthesis of mRNA, rRNA, and tRNA increases immediately Most riboswitches control True transcription translation. O tRNA synthesis. O False ribosome synthesis Previous Answers Request Answer Incorrect; Try Again; 5 attempts remainingExplanation / Answer
A common structure of protein that binds DNA is helix-turn-helix, which helps in regulating gene expression.
Conditions in lac operon for structural genes to be transcribed when lactose is available, and glucose is not available.
Riboswitches are used in translation as they cause change in production of the proteins encoded by the mRNA.