Microorganisms play key roles in the cycling of important nutrients in plant nutrition, particularly those of
A) carbon.
B) nitrogen.
C) sulfur.
D) carbon, nitrogen, and sulfur.
Answer: D
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Many proto-oncogenes encode ____
a. growth inhibiting factors b. intracellular receptors
c. tumor suppressor proteins d. receptors for growth inhibiting factors e. growth factors
People who are lactose intolerant can often consume some products made from milk such as cheese and yogurt because microorganisms in their digestive system consume the lactose. By comparison, people with a true milk allergy, which involves an immune response to milk protein, cannot consume milk or products made from milk. Given this information, what can you conclude about milk?
A. All people who are lactose intolerant are also allergic to milk. B. Lactose is a carbohydrate, not a protein and is therefore not the cause of true milk allergies. C. The protein that causes a true milk allergy is lactose. D. Yogurt contains live and active cultures of Lactobacillus acidophilus bacteria and therefore prevents an allergic response in people with a true milk allergy.
Is a fluorescent technique:
a) Kinyoun b) Auramine-rhodamine c) both d) neither
Which of the following toxins produced by Bordetella pertussis results in the accumulation of excess mucus in the trachea?
A. pertussis toxin B. adenylate cyclase toxin C. tracheal cytotoxin D. both adenylate cyclase toxin and tracheal cytotoxin E. both pertussis toxin and adenylate cyclase toxin