Staphylococcus aureus and Streptococcus pyogenes produce exotoxins known as superantigens that bind to a site on the TCR that is outside the antigen-specific TCR binding site
Indicate whether the statement is true or false.
Answer: TRUE
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Many environmental factors influence the structure of biological membranes. Which of the following could permanently disrupt phospholipid bilayers in an aqueous solution?
A. the addition of acid to change the pH B. physical agitation of the solution C. slight elevation of the temperature
A hospital burn unit has experienced ongoing problems with pseudomonad infections in multiple wards despite attention to patient hygiene and environmental sanitation. Which of the following would not be a possible source of the bacteria?
A) hospital floral shop B) skin microbiota of staff C) hospital cafeteria D) patient room cleaning supplies E) therapy pool in the physical therapy department
The horizontal transfer process known as transduction
A. involves a virus. B. requires a pilus. C. requires a cell to be "competent." D. requires a plasmid. E. involves a mutagen.
The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is ________.
A. because it provides an excellent carbon and energy source for bacteria B. because it melts at 100oC and solidifies at temperatures below 40oC C. because bacteria are unable to break it down so it stays solidified D. because it provides an excellent nitrogen source for bacteria