Several cases of nonbloody diarrhea with nausea, fever, and abdominal pain have occurred among a number of people who ate at the same restaurant. Public health officers find a food sample containing motile noncoliform, Gram-negative bacteria capable of metabolizing glucose. The "food poisoning" resulted from contamination with:
A) Yersinia
B) E. Coli
C) Citrobacter
D) Shigella
E) Salmonella
Ans: E) Salmonella
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Within the transcription bubble, the 9 most recently added nucleotides in the newly synthesized RNA strand temporarily form a helix with the template DNA strand. How might transcription be affected if helix formation did not occur?
A. Rewinding the DNA molecule would be inhibited. B. Unwinding the DNA molecule would be inhibited. C. The position of the 5' end of the RNA would be unstable, inhibiting elongation. D. The position of the 3' end of the RNA would be unstable, inhibiting elongation. E. The position of the 5' end of the RNA would be unstable, stimulating elongation.
Why are viruses not considered to be alive? What will be an ideal response?
Lead is known to undergo biomagnification and accumulate in bones. What do you predict will happen to lead taken up by a tiger after it dies in the wild?
A. The lead will reenter the food web via detritivores and decomposers. B. The lead will be broken down to a non-toxic form. C. The lead will reenter the food web via evaporation and precipitation. D. The lead will be eliminated from the food web because no species prey upon the tiger.
Reproductive systems with external fertilization are most common in
A) terrestrial animals. B) populations with many more males than females. C) animals that are widely dispersed. D) aquatic animals.