Many halophiles require a high ionic environment for survival
Indicate whether the statement is true or false.
Answer: TRUE
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Which organism is a nitrogen-fixing symbiont of legumes?
A. Clostridium B. Nitrobacter C. Pseudomonas D. Rhizobium
Which of the following is a region in DNA that binds to a steroid receptor?
A. GRE B. IRE C. CRE D. CREB
In formation of plaques by bacteriophages which of the following statements is true?
A. A plaque is the result of several different viruses initially infecting a single cell B. The plaque is the result of a single virus that has replicated in many bacterial cells in a localized area C. A plaque results when a single virus infects one cell and then does not infect any other cell D. Plaques are the areas where cells have not been infected at all
Patients who have type 2 diabetes no longer respond normally to insulin. Which statement best explains this symptom?
A. Their cells express less insulin receptor. B. The nucleus of their cells are altered so that insulin can not bind. C. The insulin receptors on their cells have mutated. D. Type 2 diabetics do not produce insulin. E. The signal transduction pathways in the cells no longer exist.