The neurotoxins of Clostridium botulinum produce (paralysis/spasms/weakness) by interfering with acetylcholine secretion
What will be an ideal response?
paralysis
Bloom's Taxonomy: Comprehension
Section: Bacterial Diseases of the Nervous System
Learning Outcome: 20.9
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At the yeast mating-type locus, the mating-type switch is initiated by introducing a double-strand break at the MAT locus. What would happen if the double-strand break were introduced at the HML? locus instead?
A. The information at MAT would change. B. The information at HML? would change. C. The information at HMLa would change. D. The information at HML? would stay the same. E. None of the choices given is correct.
A genetic mutation results in the inability for a cycad to produce coralloid roots. What types of soils would be least conducive to the survival of this cycad relative to members of the species not affected by this mutation?
A. Soils saturated with water. B. Drier soils. C. Soils with lower mean temperatures. D. Soils with lower nitrogen. E. Soils with lower pH.
What value do mortality rate curves end on?
A) 0 B) 1.0 C) however many individuals are dead D) the percentage of the population that dies in the last time period
How does the phenomenon of horizontal gene transfer muddle the concept of monophyletic groups?
A. Monophyletic groups are based on the concept that members of a particular group of species are related to one another at a particular taxonomic rank. However, a species that undergoes horizontal gene transfer no longer belongs to that taxon and the group becomes paraphyletic. B. Monophyletic groups are based on the concept that members of a particular group of species are related to one another at a particular taxonomic rank. An unrelated species that undergoes horizontal gene transfer can become more closely related to members of a different group, making that group polyphyletic. C. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs, not all of the genes in a species were inherited from the common ancestor. D. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs in the common ancestor, any species to which it gives rise can no longer be considered descendent species.