Explain why a potentially rabid dog is held for up to two weeks to check for clinical signs of rabies. Are humans more similar or dissimilar in this regard?
What will be an ideal response?
Answer: Dogs have a short incubation time when infected by rabies virus. Within 10-14 days a dog should show symptoms of the disease if infected, so only a two-week holding period is necessary for identifying a potential infection in dogs. Humans have a highly variable incubation period (a few weeks to many months), which depends on the following factors: the depth of the infected wound, the host's immune system, location of infection, and the number of viruses transmitted.
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Deinococcus radioduransis (select all that apply):
A. resistant to ionizing radiation. B. able to repair DNA breaks without ATP. C. killed via desiccation. D. unique in its ability to withstand ionizing radiation. E. adapted to withstand the desert environment.
Given the following sequence of genes on a chromosome, determine what change in chromosome structure occurred. (the * indicates the centromere)
before A B C D * E F G H after A C D * E F G H A. Terminal deletion B. Interstitial deletion C. Inversion D. Gene duplication
What conclusion did the researchers draw from the results of the feeding preference studies?
A. The capsaicin deterred the mice and rats from eating and destroying the seeds. B. The capsaicin deterred the mice and rats from eating and dispersing the seeds. C. The capsaicin deterred the thrashers from eating and destroying the seeds. D. The capsaicin deterred the thrashers from eating and dispersing the seeds.
When does recombination occur?
A) before DNA replication B) at the two-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and before DNA replication C) at the four-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and before DNA replication D) at the two-strand stage, when the sister chromatids have been separated, and after DNA replication E) at the four-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and after DNA replication