What is the usual cause of pseudomembranous colitis
A. improperly home-preserved foods containing botulin toxin
B. eating unpasteurized dairy containing Listerla monocytogenes
C. handling infected animals contaminated with E. rhusiopathiae
D. therapy with broad-spectrum antibiotics leading to superinfection by C. difficile
E. living in dose contact with someone infected with C. perfringens
Answer: D. therapy with broad-spectrum antibiotics leading to superinfection by C. difficile
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What could you use to measure metabolic rate in an animal?
A. CO? inexhalations B. Amount of food eaten C. The reactants or products of cellular respiration D. All of these are true
When both lactose and glucose are available to E. coli, which part of the lac operon regulation assures that glucose will be metabolized first?
A) RNA polymerase transcribes the lac operon to make a single RNA molecule. B) The repressor binds to the operator in the absence of lactose. C) The repressor cannot bind to the operator in the presence of lactose. D) Permease allows lactose to enter the cell when lactose enters the cell. E) CAP binds to cAMP and then to the promoter only in the presence of low glucose.
In Figure 8.1, which colonies are streptomycin-resistant and leucine-requiring?
A) 1, 2, 3, and 9 B) 3 and 9 C) 4, 6, and 8 D) 4 and 8 E) 5 and 6
Which of the following are fetal membranes? (Check all that apply.)A) ChorionB) EndometriumC) AllantoisD) AmnionE) Yolk sac
What will be an ideal response?