Quorum sensing requires a strong gradient to be reached before the signaling molecules are transported into the cytoplasm
Indicate whether the statement is true or false.
Answer: FALSE
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Explain why a potentially rabid dog is held for up to two weeks to check for clinical signs of rabies. Are humans more similar or dissimilar in this regard?
What will be an ideal response?
How do eukaryotic transcription factors exert their effects on transcription when their binding sites can be thousands of base pairs away from the promoter?
A. Regulatory proteins bind the sequences and then slide along the DNA until they reach an RNA polymerase bound to a promoter. B. After binding to the site, the regulatory protein releases the DNA and is targeted to the polymerase via coactivator proteins. C. Once bound to the site, the regulatory protein catalyzes the formation of an effector molecule that then travels to and binds the polymerase. D. The DNA between the bound site and the polymerase-promoter complex loops out, increasing proximity.
The current status of gene therapy is:
a. it is currently being used effectively to cure cystic fibrosis. b. it has been terminated because clinical trials have shown that it is ineffective. c. it is being evaluated to assess the risks associated with potential side effects. d. the number of clinical trials is increasing at an almost uncontrolled rate. e. that it may be considered in the future, but currently the technology is not available.
The purple nonsulfur bacteria ________.
A. typically can grow aerobically in the dark as chemoorganoheterotrophs B. grow anaerobically as photoorganoheterotrophs C. utilize organic molecules as a source of electrons for photosynthesis D. All of the choices are correct.