All of the following are correct about foodborne illnesses in the United States except
A) The number of cases is decreasing as people learn more ways to prevent them.
B) Most cases are probably not reported.
C) The most common bacterial cause is Campylobacter.
D) The HAACP system is designed to prevent cases.
E) The number of cases would decrease if more food were irradiated.
Answer: A) The number of cases is decreasing as people learn more ways to prevent them.
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The Hardy-Weinberg equation stats that p2 + 2pq + q2 = 1; the genotype frequency of heterozygotes is represented by
A. p2 B. 2pq C. q2 D. p2 +q2 E. p2 + 2pq
How would an animal compensate for a nonfunctional lateral line?
A. Sex recognition by male fish would have to be accomplished by the olfactory structures. B. Pressure waves in the water would have to be detected by other sensory structures. C. Propulsion and directional control would have to be facilitated by other fins. D. Gas exchange through the gill slits would have to be increased. E. Skeletal support would need to be reinforced internally.
A young couple already has three children and is expecting a fourth. Through a genetic test, the couple finds out that each of them is a carrier for cystic fibrosis. Upon counseling, they are informed that there is a 1 in 4 chance of their unborn child having cystic fibrosis and a 1 in 2 chance that he/she will be a carrier. Describe how the genetic counselor was able to determine these
probabilities. The husband deduces that the child will be born with cystic fibrosis because the other 3 children do not have it. Explain why this reasoning is faulty. How would you handle the situation? What will be an ideal response?
If complementary DNA strands were arranged in a parallel manner, what would you expect to see?
A) Complementary nucleotides would be attracted to each other, forming ionic bonds that would make the helix stable but not uniform in width. B) Charges of complementary nucleotides would repel and no hydrogen bonds would form. C) Complementary nucleotides would line up properly; but fewer hydrogen bonds would form, so the strands could be more easily pulled apart. D) Purines would pair with both purines and pyrimidines due to the closer alignment of the parallel strands. E) There would be no discernable difference between DNA strands aligned in a parallel versus an antiparallel manner.