All of the following characteristics are common to facilitated diffusion and active transport except for ____
a) none of the choices is correct
b) the requirement of energy
c) high specificity
d) the use of a membrane-spanning protein
Ans: b) the requirement of energy
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The structural genes of the lactose operon are: (Select all correct choices)
A. always expressed unless the operon is turned off by a repressor. B. turned on in the presence of lactose. C. turned off by the presence of lactose.
Which of the following statements is not true regarding Clostridium difficile?
A. Infection is precipitated by broad-spectrum antibiotic therapy. B. It produces "rice-water" stools. C. It is a gram-positive, endospore-forming rod. D. It is part of the normal intestinal biota. E. It is also called pseudomembranous colitis.
Cyclic AMP activity is associated with hydrophobic hormones
Indicate whether the statement is true or false.
Which of the following is incorrect regarding Yersinia pestis?
A. It produces coagulase as a virulence factor. B. It has a capsule as a virulence factor. C. It produces an enterotoxin. D. It exhibits bipolar staining and appears to resemble a safety pin. E. It is a gram-negative rod.